Unit 3Multiplication &

Division

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Multiplication FactsStudents will be timed on their

multiplication facts

On Grade students must master their 0-10 facts

Above Grade students must master 0-12 facts.

Multiplication Strategies Groups of:

3 groups of 4 = 12

Repeated Addition: Add 3 Four separate times3 + 3 = 6 + 3 = 9 + 3 = 12

Multiplication Strategies Continued Arrays:

3 x 5 (down x across)

x x x x x x x x x x x x x x x

Number Lines: (see next slide)

Number Line Multiplication

Spaces x Jumps5 x 6

0 5 10 15 20 25 30

Division Strategies Groups of:

21 ÷ 3 = 5

Repeated Subtraction: 21 ÷ 3

Fact Families

48

6

x ÷

______ x _______ ________ ÷ ________

_____ x ________ ________ ÷ ________

Comparison Multiplication Students will be able represent multiplication

through pictures

Sally

Kelly

Sally has ____ times as many pandas as Kellydoes.

Multiplication & Division Word Problems Students must be able to write their own

multiplication word problem

Ex: Karen has 5 oranges. Jeff has 2 times as many oranges as Karen does. How many oranges does Jeff have?

Multiplication & Division Word Problems Continued… When given a word problem students will need to

evaluate the problem to determine if they need to multiply or divide.

Ex Multiplication: There are 5 trees in Susan’s backyard. There are 4 birds sitting on each tree. How many total birds are there?

Ex Division: Jason has 40 baseball cards and 8 shoeboxes. He wants to put an even number of cards in each box. How many cards will go in each box?

Estimating the Product

45 50x 6 x 6

300

3rd Grade Challenge

Expressions Use the strategy of PEMDAS

P Parenthesis

E Exponents (we will not solve problems with exponents)

M Multiplication

D Division

A Addition

S Subtraction

(56 ÷ 7) x 4 =

Commutative PropertyIf number sentence is reversed you will

always have the same answer

( 4 + 3 = 7 OR 3 + 4 = 7……5 x 6 = 30 OR 6 x 5 = 30)

Commutative Property If an addition/multiplication number

sentence is reversed the sum/product will remain the same

Example: 4 + 3 = 7 OR 3 + 4 = 7

Example: 4 x 3 = 12 OR 3 x 4 = 12

Factors and Multiples

Factor – numbers that multiply together to get a product Factors of 10 are: 1, 10, 5, 2

Multiple – Product of a number x number Multiples of 10 are: 10, 20, 30, 40, 50, etc.

Solving for the Unknown The unknown will be represented by a letter

(ex: x, y, p) 46 + p = 50

p = 4

Function Tables Rule: y = x + 5 X Y

10 15

20 25

30 35

40 45

50 55

Solving for the Unknown Word Problem Jason has 25 toy cars. He adds in some toy

trucks. He now has a total of 52 toys.

Students will have to identify… What 25 represents What 52 represents What the unknown is

Students will have to… Create an equation Solve for the unknown