math riddle book - puzzle worksheets that teach math! - secret code book · 2015. 2. 9. · in an...

Website: http://www.secretcodemath.com/

E-mail: [email protected]

Thank you for purchasing and downloading this eBook.

Permission is given to the individual purchaser of this book tomake copies for use in a single classroom or home.

Copyright 2009 - Tim Wei

Secret Code Math - www.secretcodemath.com

http://www.secretcodemath.com/


mailto:[email protected]



Welcome to the Secret Code Math BookKids need to master basic operations, including addition, subtraction,

multiplication, and division. The only way to do this is through consistent,

repetitive practice. Unfortunately, most drill-and-practice worksheets are dull and

tedious for students to complete.

In an effort to make math practice more fun, I have developed two printable

eBooks filled with math worksheets that seem more like puzzles and less like

math work.

The first book, Math Riddle Book, was released in 2007 and has been a huge hit

with students, parents, and teachers. It features corny, laugh-out-loud riddles

that kids love! Kids can unlock the answers to the riddles by solving a set of Math

problems.

The second book, Secret Code Math, is the one you're reading right now. The

worksheets in this book feature a symbol key that kids must use to decode the

numbers in a math problem before they can find the answers. In addition to

teaching math skills, Secret Code Math helps kids build concentration and logical

reasoning.

I hope your students enjoy learning with the worksheets in this book!

Sincerely,

Tim WeiP.S. Please, if you have any questions, comments, or suggestions, please feel free

to e-mail me. My address is: [email protected]



http://www.mathriddlebook.com/




Secret Code MathSecret Code MathTable of ContentsTable of Contents

Addition3-Digit Addends ............................................................................... 5

Addition4-Digit Addends ............................................................................... 7

AdditionColumn Addition: 3-Addends, 3-Digits ................................................ 9

AdditionColumn Addition, 3-Addends, 4-Digits ................................................. 11

SubtractionNo Borrowing, 2-Digit Numbers .......................................................... 13

SubtractionBorrowing (Regrouping), 2-Digit Numbers .......................................... 15

SubtractionBorrowing (Regrouping), 3-Digit numbers .......................................... 17

SubtractionBorrowing (Regrouping) Across Zero, 3-Digit Numbers ........................ 19

SubtractionSubtraction (Regrouping) Across Zero, 4-Digit Numbers ........................ 21

MultiplicationBasic Facts 0 - 9 ............................................................................. 23

MultiplicationBasic Facts 0 - 12 ............................................................................. 25

MultiplicationHundreds Patterns .......................................................................... 27



Secret Code MathTable of ContentsTable of Contents

Multiplication2-Digits by 1-Digit .......................................................................... 29

Multiplication3-Digits by 1-Digit .......................................................................... 31

Multiplication2-Digits by 2-Digits ......................................................................... 33

Multiplication3-Digits by 2-Digits ......................................................................... 35

DivisionBasic Facts ..................................................................................... 37

Division1-Digit Quotients with Remainders .................................................... 39

Division2-Digit Quotients without Remainders ................................................ 41

Division2-Digit Quotients with Remainders ................................................... 43

RoundingRounding to the Nearest Ten ............................................................ 45

RoundingRounding to the Nearest Hundred ..................................................... 47

ComparingCompare Numbers Using, <, >, and = .............................................. 49



Name: ___________________________

Secret Code MathAddition with 3-Digit Addends

Decode the addends and find the sums.

1 2 3 4 5 6 7 8 9 0

Code Numbers Regular Numbers Code Numbers Regular Numbers

1 4 6

+ + 1 7 3 +


+ +


+ +



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0


1 4 6 2 5 6

+ + 1 7 3 + + 4 5 3

3 1 9 7 0 9


3 8 8 4 5 0

+ + 7 6 3 + + 9 1 5

1, 1 5 1 1 ,3 6 5


6 0 3 6 9 1

+ + 7 8 3 + + 1 5 4

1, 3 8 6 8 4 5



Name: ___________________________



1 2 3 4 5 6 7 8 9 0


2, 3 6 9

+ + 1, 0 2 3 +


+ +


+ +



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0


2, 3 6 9 5, 7 9 0

+ + 1, 0 2 3 + + 4, 8 3 0 3, 3 9 2 1 0, 6 2 0


6, 7 2 5 3, 7 7 8

+ + 9 4 8 + + 2, 6 4 9

7, 6 7 3 6, 4 2 7


4, 3 2 1 8, 4 3 4

+ + 5, 9 7 2 + + 8 0 6

1 0, 2 9 3 9, 2 0 4



Name: ___________________________

Secret Code MathColumn Addition with 3-Digit Addends


1 2 3 4 5 6 7 8 9 0- : D L m h x V O b

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

- D h 1 3 6 O b m

D h V 3 6 8 L : -

+ O - + 9 1 + h b :

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

D m m x V :

h b x : x :

+ x L + : V x

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

L V : O b O

h D - h L

+ - O O + V m b



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0- : D L m h x V O b

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

- D h 1 3 6 O b m 9 0 5

D h V 3 6 8 L : - 4 2 1

+ O - + 9 1 + h b : + 6 0 2

m O m 5 9 5 - O : V 1, 9 2 8

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

D m m 3 5 5 x V : 7 8 2h b x 6 0 7 : x : 2 7 2

+ x L + 7 4 + : V x + 2 8 7- b D h 1, 0 3 6 - D V - 1, 3 4 1

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

L V : 4 8 2 O b O 9 0 9

h D 6 3 - h L 1 6 4

+ - O O + 1 9 9 + V m b + 8 5 0

x L L 7 4 4 - O : D 1, 9 2 3



Name: ___________________________



1 2 3 4 5 6 7 8 9 0


7, 4 5 6

3, 6 8 1

+ + 2, 3 4 4 +


+ +


+ +



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0


7, 4 5 6 2, 0 6 7 3, 6 8 1 6 0 9

+ + 2, 3 4 4 + + 2 4 1 3, 4 8 1 2, 7 0 0


8, 0 7 4 4, 2 8 6 6, 8 0 3 2, 4 6 8

+ + 2, 7 1 0 + + 5, 7 3 1 1 7, 5 8 7 1 2, 4 8 5


2, 2 2 2 1, 0 2 0 3, 3 3 3 6 0 6 4, 4 4 4 3, 0 0 7

+ + 5, 5 5 5 + + 4 8 1 5, 5 5 4 4, 6 8 1



Name: ___________________________

Secret Code MathSubtraction (No Borrowing): 2-Digit Numbers

Decode the numbers and find the differences.

1 2 3 4 5 6 7 8 9 0

r p y n w h f l k e

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

lf 8 7 yl- ph - 2 6 - w

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

ky hk- wy - nh

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

fk fw- yf - nn



Name: ___________________________ ANSWER KEY

Secret Code MathSubtraction (No Borrowing): 2-Digit Numbers


1 2 3 4 5 6 7 8 9 0

r p y n w h f l k e

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

lf 8 7 yl 3 8

- ph - 2 6 - w - 5

hr 6 1 yy 3 3

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

ky 9 3 hk 6 9

- wy - 5 3 - nh - 4 6

ne 4 0 py 2 3

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

fk 7 9 fw 7 5

- yf - 3 7 - nn - 4 4

np 4 2 yr 3 1



Name: ___________________________

Secret Code MathSubtraction with Borrowing: 2-Digit Numbers


1 2 3 4 5 6 7 8 9 0

m p q y w A f l k e

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

A p 6 2 l e

- q y - 3 4 - A w

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

f m k q

- p f - p A

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

q y w f- m k - y k



Name: ___________________________ ANSWER KEY

Secret Code MathSubtraction with Borrowing: 2-Digit Numbers


1 2 3 4 5 6 7 8 9 0

m p q y w A f l k e

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

A p 6 2 l e 8 0

- q y - 3 4 - A w - 6 5

p l 2 8 m w 1 5

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

f m 7 1 k q 9 3

- p f - 2 7 - p A - 2 6

y y 4 4 A f 6 7

CodeNumbers

RegularNumbers

CodeNumbers

RegularNumbers

q y 3 4 w f 5 7

- m k - 1 9 - y k - 4 9

m w 1 5 l 8



Name: ___________________________

Secret Code MathSubtraction with Borrowing: 3-digit Numbers


1 2 3 4 5 6 7 8 9 0n g / o B , ' " ? u

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

/ ? o 3 9 4 o n '

- ' " - 7 8 - n ' B

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

" g , , " g

- / ' u - g o

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

g o ' o / u

- n " g - g g ,



Name: ___________________________ ANSWER KEY

Secret Code MathSubtraction with Borrowing: 3-digit Numbers


1 2 3 4 5 6 7 8 9 0n g / o B , ' " ? u

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

/ ? o 3 9 4 o n ' 4 1 7

- ' " - 7 8 - n ' B - 1 7 5

/ n , 3 1 6 g o g 2 4 2

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

" g , 8 2 6 , " g 6 8 2- / ' u - 3 7 0 - g o - 2 4

o B , 4 5 6 , B " 6 5 8

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

g o ' 2 4 7 o / u 4 3 0

- n " g - 1 8 2 - g g , - 2 2 6

, B 6 5 g u o 2 0 4



Name: ___________________________

Secret Code MathSubtraction Across Zero: 3-Digit Numbers


1 2 3 4 5 6 7 8 9 0

Q G q F O , m U B T

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

FTT 4 0 0 mTT- QG, - 1 2 6 - qUG

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

OTT FTm- GOO - QOB

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

mTG qTT- qQB - QUT



Name: ___________________________ ANSWER KEY

Secret Code MathSubtraction Across Zero: 3-Digit Numbers


1 2 3 4 5 6 7 8 9 0

Q G q F O , m U B T

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

FTT 4 0 0 mTT 7 0 0

- QG, - 1 2 6 - qUG - 3 8 2

GmF 2 7 4 qQU 3 1 8

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

OTT 5 0 0 FTm 4 0 7

- GOO - 2 5 5 - QOB - 1 5 9

GFO 2 4 5 GFU 2 4 8

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

mTG 7 0 2 qTT 3 0 0

- qQB - 3 1 9 - QUT - 1 8 0

qUq 3 8 3 QGT 1 2 0



Name: ___________________________

Secret Code MathSubtraction Across Zero - 4-digit Numbers


1 2 3 4 5 6 7 8 9 0


4, 0 0 7

- - 1, 5 9 8 -


- -


- -



Name: ___________________________ ANSWER KEY

Secret Code MathSubtraction Across Zero - 4-digit Numbers


1 2 3 4 5 6 7 8 9 0


4, 0 0 7 5, 0 0 0

- - 1, 5 9 8 - - 2, 6 1 4

2, 4 0 9 2, 3 8 6


6, 0 0 0 9, 0 0 7

- - 1 8 - - 8 7 3 5, 9 8 2 8, 1 3 4


2 0 0 9 4, 0 0 3

- - 1 9 9 8 - - 2, 8 7 1

1 1 1, 1 3 2



Name: ___________________________

Secret Code MathMultiplication: Basic Facts 0 - 9

Decode the numbers. Write the real numbers above the symbols. Then, multiply the numbers to find the products. The first one has been done for you.

1 2 3 4 5 6 7 8 9 0

❙ ♠ ♥ ♣ ♦ ✿ ✣ ◗ ❢

7 8

✣ x ◗ 5 6 x ✣

◗ x ✿ ♥ x ◗

❢ x ♠ ✿ x ✣

♥ x ✣ x ♦

♣ x ◗ x ♣



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0

❙ ♠ ♥ ♣ ♦ ✿ ✣ ◗ ❢

7 8 9 7

✣ x ◗ 5 6 x ✣ 6 3

8 6 3 8

◗ x ✿ 4 8 ♥ x ◗ 2 4

0 2 6 7

❢ x ♠ 0 ✿ x ✣ 4 2

3 9 7 5

♥ x 2 7 ✣ x ♦ 3 5

4 8 9 4

♣ x ◗ 3 2 x ♣ 3 6



Name: ___________________________



1 2 3 4 5 6 7 8 9 0

1 2 2

x 2 4 x

x x

x x

x x

x x



Name: ___________________________ ANSWER KEY



1 2 3 4 5 6 7 8 9 0

1 2 2 9 8

x 2 4 x 7 2

6 9 1 2 7

x 5 4 x 8 4

1 1 5 7 4

x 5 5 x 2 8

3 6 1 2 1 1

x 1 8 x 1 3 2

8 8 8 1 2

x 6 4 x 9 6



Name: ___________________________

Secret Code MathMultiplication: 100s Patterns

Decode the numbers and find the products.

1 2 3 4 5 6 7 8 9 0T { H O V W U S ? %

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

W % % 6 0 0 U % %

x O x 4 x S

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

V % % ? % %

x W x S

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

H % % { % %

x ? x V



Name: ___________________________ ANSWER KEY

Secret Code MathMultiplication: Patterns in 100s


1 2 3 4 5 6 7 8 9 0T { H O V W U S ? %

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

W % % 6 0 0 U % % 7 0 0

x O x 4 x S x 8

{ O % % 2, 4 0 0 V W % % 5, 6 0 0

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

V % % 5 0 0 ? % % 9 0 0x W x 6 x S x 8H % % % 3, 0 0 0 U { % % 7, 2 0 0

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

H % % 3 0 0 { % % 2 0 0

? x 9 V x 5

{ U % % 2, 7 0 0 T % % % 1, 0 0 0



Name: ___________________________

Secret Code MathMultiplication: 2-Digits by 1-Digit


1 2 3 4 5 6 7 8 9 0

z I w l u t K A F s


I w 2 3 A sx K x 7 x l


u A K Kx t x F


I l A wx u x K



Name: ___________________________ ANSWER KEY

Secret Code MathMultiplication: 2-Digits by 1-Digit


1 2 3 4 5 6 7 8 9 0

z I w l u t K A F s


I w 2 3 A s 8 0

x K x 7 x l x 4

z t z 1 6 1 w I s 3 2 0


u A 5 8 K K 7 7

x t x 6 x F x 9

w l A 3 4 8 t F w 6 9 3


I l 2 4 A w 8 3

x u x 5 x K x 7

z I s 1 2 0 u A z 5 8 1



Name: ___________________________

Secret Code MathMultiplication 3-Digits by 1-Digit


1 2 3 4 5 6 7 8 9 0n o u g

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

o 4 6 2 g

x x 3 x o

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

n

x x u

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

o o u

x x



Name: ___________________________ ANSWER KEY

Secret Code MathMultiplication 3-Digits by 1-Digit


1 2 3 4 5 6 7 8 9 0n o u g

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

o 4 6 2 g 5 0 9

x x 3 x o x 4

n u 1, 3 8 6 g 2, 0 3 6

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

n 1 6 6 2 5 3x x 7 x u x 8n n 1, 1 6 2 g o 2, 0 2 4

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

o o 4 4 7 u 2 7 8

x x 9 x x 2

o g 4, 0 2 3 5 5 6



Name: ___________________________

Secret Code MathMultiplication: 2-Digits by 2-Digits


1 2 3 4 5 6 7 8 9 0^ ] [ * ` } { \ % 5


*} 4 6 %5

x ^] x 1 2 x *{


[] } }

x \^ x * 5


{ ` `^

x [{ x \*



Name: ___________________________ ANSWER KEY

Secret Code MathMultiplication: 2-Digits by 2-Digits


1 2 3 4 5 6 7 8 9 0^ ] [ * ` } { \ % 5


*} 4 6 %5 9 0

x ^] x 1 2 x *{ x 4 7

``] 5 5 2 *] [ 5 4 2 3 0


[] 3 2 } } 6 6

x \^ x 8 1 x * 5 x 4 0

] `%] 2 5 9 2 ] } * 5 2 6 4 0


{ ` 7 5 `^ 5 1

x [{ x 3 7 x \* x 8 4

] { { ` 2 7 7 5 *] \* 4 2 8 4



Name: __________________________

Secret Code MathMultiplication 3-Digits by 2-digits


1 2 3 4 5 6 7 8 9 0

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

8 0 2

x x 1 3 x

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

x x

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

x x



Name: ___________________________ ANSWER KEY

Secret Code MathMultiplication 3-Digits by 2-digits


1 2 3 4 5 6 7 8 9 0

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

8 0 2 5 2 3

x x 1 3 x x 2 6

1 0 , 4 2 6 1 3 , 5 9 8

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

7 0 1 6 9 7x x 3 6 x x 1 1 2 5 , 2 3 6 7, 6 6 7

Code Numbers

Regular Numbers

Code Numbers

Regular Numbers

4 0 0 5 4 9

x x 7 8 x x 4 2

3 1 , 2 0 0 2 3 , 0 5 8



Name: ___________________________

Secret Code MathDivision: Basic Facts

Decode the numbers and find the quotients.

1 2 3 4 5 6 7 8 9 0n ]m [l k j̀ }b {h g\ x c


b k g 6 4 8 g j b


x j k h k m


l m k h k x



Name: ___________________________ ANSWER KEY

Secret Code MathDivision: Basic Facts


1 2 3 4 5 6 7 8 9 0n ]m [l k j̀ }b {h g\ x c


g 8 h 7

b k g 6 4 8 g j b 8 5 6


}b 6 }b 6

x j k 9 5 4 h k m 7 4 2


g 8 h 7

l m k 3 2 4 h k x 7 4 9



Name: ___________________________

Secret Code MathDivision: One Digit Quotients with Remainders


1 2 3 4 5 6 7 8 9 0n h x k g b v r u 2


r n g 8 1 5 k h b


r h 2 u h r


r b b v x x



Name: ___________________________ ANSWER KEY

Secret Code MathDivision: One Digit Quotients with Remainders


1 2 3 4 5 6 7 8 9 0n h x k g b v r u 2


1 r7 6 r2

r n g 8 1 5 k h b 4 2 6


2 r4 3 r1

r h 2 8 2 0 u h r 9 2 8


8 r2 4 r5

r b b 8 6 6 v x x 7 3 3



Name: ___________________________

Secret Code MathDivision: Two Digit Quotients (No Remainders)


1 2 3 4 5 6 7 8 9 0 G W O V B


W O G 7 1 8 2 B O


V V W


G



Name: ___________________________ ANSWER KEY

Secret Code MathDivision: Two Digit Quotients (No Remainders)


1 2 3 4 5 6 7 8 9 0 G W O V B


G 2 6 O 6 8

W O G 7 1 8 2 B O 6 4 0 8


3 5 1 3

V 9 3 1 5 V W 9 1 1 7


W V 7 9 W 4 7

4 3 1 6 G 5 2 3 5



Name: ___________________________

Secret Code MathDivision: Two Digit Quotients with Remainders


1 2 3 4 5 6 7 8 9 0


2 4 7





Name: ___________________________ ANSWER KEY

Secret Code MathDivision: Two Digit Quotients with Remainders


1 2 3 4 5 6 7 8 9 0


2 3 r1 1 3 r4

2 4 7 5 6 9


4 8 r1 2 2 r2

2 9 7 3 6 8


1 3 r3 2 4 r1

7 9 4 4 9 7



Name: ___________________________

Secret Code MathRounding to the Nearest Ten

Decode the numbers and round to the nearest ten.

1 2 3 4 5 6 7 8 9 0x o v

Code Numbers

RealNumbers

Round to the Nearest Ten

4 8 5 0

o

v

x o v

o



Name: ___________________________ ANSWER KEY

Secret Code MathRounding to the Nearest Ten

Decode the numbers and round to the nearest ten.

1 2 3 4 5 6 7 8 9 0x o v

Code Numbers

RealNumbers

Round to the Nearest Ten

4 8 5 0

o 2 3 2 0

v 7 5 8 0

8 6 9 0

9 4 9 0

x o v 1 2 7 1 3 0

o 2 6 4 2 4 0

6 0 5 6 1 0



Name: ___________________________

Secret Code MathRounding to the Nearest Hundred

Decode the numbers and round to the nearest hundred.

1 2 3 4 5 6 7 8 9 0 ✿

Code Numbers

RealNumbers

Round to the Nearest Hundred

✿ 2 6 3 3 0 0

✿



Name: ___________________________ ANSWER KEY

Secret Code MathRounding to the Nearest Hundred

Decode the numbers and round to the nearest hundred.

1 2 3 4 5 6 7 8 9 0 ✿

Code Numbers

RealNumbers

Round to the Nearest Hundred

✿ 2 6 3 3 0 0

✿ 5 3 9 5 0 0

8 0 8 8 0 0

4 5 0 5 0 0

8 4 1 0 0

8 6 1 9 0 0

6, 5 2 7 6, 5 0 0

8, 7 5 2 8, 8 0 0



Name: ___________________________

Secret Code MathComparing Numbers Using <, >, and =

Decode the numbers. Write the real numbers above the symbols. Then use <, >, or = to compare. The first one has been done for you.

1 2 3 4 5 6 7 8 9 0

3 4 5 5 4 3 <



Name: ___________________________ ANSWER KEY

Secret Code MathComparing Numbers Using <, >, and =

Decode the numbers. Write the real numbers above the symbols. Then use <, >, or = to compare. The first one has been done for you.

1 2 3 4 5 6 7 8 9 0

3 4 5 5 4 3 2 4 3 2 3 4 < >

1 2 8 1 2 4 6 8 0 8 0 6

> <

3 4 6 3 4 6 2 9 9 2 0 1 >

6 0 1 4 9 9 6 7 8 6 8 7 > <

8 9 1 0 2 5 5 5 4 6 9

< >

7 1 6 6 1 7 2 2 8 2 8 2

> <



math riddle book - puzzle worksheets that teach math! - secret code book · 2015. 2. 9. · in an...

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