Subtract Two Digits Using Blocks and Number Line

Look at the patterns below. Pattern 1: 42, 40, 38, 36, _____, 32 Pattern 2: 33, 38, 43, 48, _____, 58 Which sentences are true? Choose the FOUR correct answers.

• The rule for pattern 1 is "subtract 2"

• The rule for pattern 1 is "add 2"

• The rule for pattern 2 is "add 5"

• The missing number in pattern 1 is 34.

• The missing number for pattern 2 is 53.

• Add

• Subtract

10-2 =

• 12

• 2

• 8

• 6

20- 13=

• 23

• 17

• 7

• 8

What subtraction problem is shown?

• 51-23=28

• 28+23=51

• 51-50-30=26

• 51-30=28

19- 17=

• 2

• 4

• 18

• 29

18-10=

• 10

• 18

• 2

• 8

• A

• B

• C

• D

What is the solution to 10-5?

• 6

• 5

• 8

• 7

18- 9=

• 6

• 10

• 8

• 9