CP2 Review

CP2 Review

Addition and Subtraction of 2 Digit Numbers

Fluently Add and Subtract within 30

Pay close attention to the symbols!

Multiple Choice

14 + 9

• 24

• 23

• 22

Multiple Choice

25 - 9

• 16

• 15

• 14

• 13

Multiple Choice

8 + 9

• 15

• 16

• 17

• 18

Multiple Choice

28 - 7

• 23

• 22

• 21

• 20

Solve Word Problems

Read the whole question

• What do you need to find? Highlight it

• What do you already know? Circle It

• Solve using a strategy - model, equation

Adding Up to 4 2-digit numbers

Stack the numbers

• Look for facts you know in the ones

• Regroup into the tens

• Look for facts you know in the tens

You could use expanded form

76 + 10 + 13 could also be solved by adding up:

6 + 0 + 3 = ______

70 + 10 + 10 = ______

Then put your two answers together!

Multiple Choice

15 + 13 + 17 =

• 35

• 45

• 44

• 46

Multiple Choice

22 + 18 + 19 + 3=

• 62

• 42

• 52

• 61

Add and Subtract 10 and 100

Use Place Value

• If you are adding or subtracting 10, you only change the tens (unless it is near a new hundreds)

• If you are adding or subtracting 100, you only change the hundreds (unless your new number is less than 100, or more than 999!)

95 + 10

• 95 has a 9 in the tens. Adding a ten, gives you ten tens. That means your answer has to more than 100.

Multiple Choice

92 + 10

• 102

• 192

Multiple Choice

107 - 10

• 117

• 7

• 97

Multiple Choice

There are 145 balls in the gym. Coach gave 100 away for recess. How many balls are left?

• 245

• 45

• 135

• 155

Multiple Choice

There are 453 students in grade 2 in JC Schools. 100 students move away. How many students are there now?

• 443

• 354

• 553