reteaching subtracting on a hundred chart

Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. 2

Reteaching

7-3NameSubtracting on a Hundred ChartA hundred chart can help you subtract.

Find 36 ! 24.

1. Start at 24.

2. Move down to 34. This is the row that 36 is in.

One row down makes 10 .

3. Move right from 34 to 36 to count 2 ones.

4. Count the tens down and ones across.

10 " 2 # 12 , so 36 ! 24 # 12.

Subtract using the hundred chart.

1. 87 ! 72 # 2. 79 ! 48 #

3. 65 ! 41 # 4. 99 ! 52 #

5. 35 ! 13 # 6. 84 ! 33 #

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100

Practice

7-3


NameSubtracting on a Hundred ChartSubtract using the hundred chart.

1. 47 ! 31 " 16 2. 78 ! 25 "

3. 99 ! 43 "

4. 37 ! 16 "

5. 55 ! 23 "

6. 64 ! 26 "

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100

9. Journal Explain how to use a hundred chart to subtract.

7. A pan holds 36 biscuits. Kiana put 12 biscuits on the pan.

How many more biscuits YKNN�ƂV�QP�VJG�RCP!

! 24 biscuits

" 23 biscuits

# 22 biscuits

$ 21 biscuits

8. A garden has room for ��ƃQYGTU��&CP�PGGFU�VQ�RNCPV��OQTG�ƃQYGTU�

� � *QY�OCP[�ƃQYGTU�FKF� &CP�CNTGCF[�RNCPV!

!� ��ƃQYGTU

"� ��ƃQYGTU

#� ��ƃQYGTU

$� ��ƃQYGTU


Reteaching

7-4NameSubtracting Multiples of 10A hundred chart can help you subtract.

Find 60 ! 30.

1. Start at 60.

2. Move back by ten from 60 to 50, from 50 to 40, and from 40 to 30. 30 is the difference.

One row up makes 10 .

3. Count the tens up.

30, so 60 ! 30 " 30.

Subtract using the hundred chart.

1. 70 ! 10 " 2. 90 ! 10 "

3. 40 ! 10 " 4. 80 ! 40 "

5. 50 ! 30 " 6. 60 ! 20 "

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100

Practice

7-4


NameSubtracting Multiples of 10Subtract using the hundred chart.

1. 50! 30 " 202. 80 ! 30 "

3. 90 ! 40 "

4. 40 ! 20 "

5. 60 ! 20 "

6. 70 ! 10 "

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100

9. Journal Explain how to use a hundred chart to subtract.

7. A pan holds 40 biscuits. Kiana put 10 biscuits on the pan.

How many more biscuits YKNN�ƂV�QP�VJG�RCP!

! 30 biscuits

" 20 biscuits

# 10 biscuits

$ 40 biscuits

8. A garden has room for 90�ƃQYGTU��&CP�PGGFU�VQ�plant 50�OQTG�ƃQYGTU�

� � *QY�OCP[�ƃQYGTU�FKF� &CP�CNTGCF[�RNCPV!

!� ��ƃQYGTU

"� ��ƃQYGTU

#� ��ƃQYGTU

$� ��ƃQYGTU

Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. 2R 7•5

Reteaching

7-50COG

2TQDNGO�5QNXKPI��/KUUKPI�QT�'ZVTC�+PHQTOCVKQP

5QNXG�

6JGTG�CTG��EJKNFTGP��QP�C�DQYNKPI�VGCO��/KMG�DQYNU�C�UEQTG�QH��5JGTT[�DQYNU�C�UEQTG�QH��*QY�OWEJ�JKIJGT�KU�/KMGoU�UEQTG!

�6JG�FKHHGTGPEG�DGVYGGP�/KMGoU�CPF�5JGTT[oU�UEQTG�

�/KMGoU�UEQTG�CPF�5JGTT[oU�UEQTG�

55 !�30�"�25�6JGTG�CTG��EJKNFTGP�QP�VJG�VGCO��

%TQUU�QWV�VJG�GZVTC�KPHQTOCVKQP��5QNXG�VJG�RTQDNGO�KH�[QW�JCXG�VJG�KPHQTOCVKQP�[QW�PGGF�

�� 6JGTG�CTG��CFWNVU�CV�VJG�DQYNKPI�CNNG[�6JGTG�CTG��EJKNFTGP�CV�VJG�DQYNKPI�CNNG[��/CTM�DQYNU�C�UEQTG�QH��

� � *QY�OCP[�OQTG�CFWNVU�VJCP�EJKNFTGP�CTG�VJGTG!

� � 5QNXG�KH�[QW�ECP�� !� �"�

5QOGVKOGU�[QW�FQ�PQV�JCXG��GPQWIJ�KPHQTOCVKQP�VQ�UQNXG�C�RTQDNGO��5QOGVKOGU�[QW�JCXG�VQQ�OWEJ�KPHQTOCVKQP�CPF�[QW�FQ�PQV�PGGF�KV�VQ�UQNXG�C�RTQDNGO�

��9JCV�KPHQTOCVKQP�FQ�[QW�PGGF�VQ�UQNXG�VJG�RTQDNGO!

��9JCV�KPHQTOCVKQP�KU�GZVTC!

��9JCV�FQ�[QW�PGGF�VQ�HKPF�QWV!

Practice

7-5


NameProblem Solving: Missing or Extra InformationCircle Extra Information or Missing Information.Then write a number sentence if the problem can be solved.1. Julia painted 12 pictures

and made 3 clay baskets at school. Julia took 5 pictures home. How many pictures are left at school?

2. Nico cut out 15 red circles and 10 yellow circles. Then he gave away some red circles. How many red circles does Nico have left?

Spatial Thinking Draw a picture to solve each problem. Then choose the correct answer.

Extra Information

Missing Information

12 ! 5 " 7 pictures

Extra Information

Missing Information

! " red circles

3. A bush had 18 berries.A raccoon ate 9 of the berries. Then the raccoon CVG��ƂUJ��*QY�OCP[� berries are left?

! 11 berries

" 10 berries

# 9 berries

$ 8 berries

4. A bowl holds 16 oranges and 4 apples. Children eat 9 oranges. How many oranges are left in the bowl?

! 7 oranges

" 8 oranges

# 9 oranges

$ 10 oranges

OnesTens

OnesTens OnesTens

OnesTens OnesTens


Reteaching

8-1Name

Regrouping 10 Ones for 1 Ten

Find the sum. 24 � 8 �

Regroup 10 ones as 1 ten.

There are 3 tens and 2 ones

24 � 8 � 32Regroup 10 ones as 1 ten. Add. Count the tens and the ones.

1. 2.

28 � 3 � 47 � 7 �

3. 4.

55 � 6 � 36 � 8 �

Practice

8-1

P 8•1 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved. 2

𝖠

𝖡

𝖢

𝖣

𝖠

𝖡

𝖢

𝖣

� � 31� �

� �

� �

OnesTens OnesTens OnesTens


Reteaching

8-2

�

� �42

� � 12 � � 4

�

2

� � � �

�

2

1

�

4 2

1

Practice

8-2


𝖠

𝖡

𝖢

𝖣

�

3 3

1

� � �

� � � �

�


Reteaching

8-3Name

Adding Two- and One-Digit Numbers

Remember the steps for adding. Step 1: Add the ones.Step 2: Regroup if there are more than 10 ones.Step 3: Add the tens.

37 � 6 � ?There are more than 10 ones. Regroup 13 as 1 ten and 3 ones. Add.

Use paper and pencil to add.

1. Do you need to regroup? 2. Do you need to regroup? Yes No Yes No

3. Do you need to regroup? 4. Do you need to regroup? Yes No Yes No

Tens Ones

�

3 7 6

4 3

1

Tens Ones

�

2 8 4

Tens Ones

�

3 6 9

Tens Ones

�

3 4 5

Tens Ones

�

4 6 4

Practice

8-3


𝖠

𝖡

𝖢

𝖣

�

8 3� � �

� � � �

1

OnesTensOnesTens OnesTens


Reteaching

8-4Name

Models to Add Two-Digit Numbers

Add 46 � 18.

So, 46 � 18 � 64.

Follow the steps. Use connecting cubes and the workmat. Add.

Step 1: How many ones?

6 � 8 � 14

Step 2: Do I need to regroup?

yes no

Step 3: How many tens?

5 � 1 � 6 tens

Tens Ones

�

4 61 8

4

Tens Ones

�

4 61 8

4

1Tens Ones

�

4 61 8

6 4

1

Tens Ones

�

2 42 9

Tens Ones

�

5 21 7

Tens Ones

�

3 84 5

Tens Ones

�

1 76 3

1.

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Practice

8-4


𝖠

𝖡

𝖢

𝖣

�

8 2

1

� � �

�


Reteaching

8-5

� � � �

� � � �

�

�

6 1

1

�

4 8

� � �

�

Practice

8-5


� � � �

� � � �

𝖠 𝖠

𝖡 𝖡

𝖢 𝖢

𝖣 𝖣

�

7 8� � �

� � � �


Reteaching

8-6

� �

� �39�

� �

� �

0 10 20155 25 30 35 40 45 50

0 10 20155 25 30 35 40 45 50

Practice

8-6


Name

Adding on a Number Line

1. Show the addition problem on the number line.

18 � 23 �

2. What addition problem does the number line show?

� �

3. Journal A class has 19 girls and 19 boys. How many girls and boys all together are in the class? Draw a number line to solve. Explain why you don’t begin at 0 to show the second number.

reteaching subtracting on a hundred chart

Documents