Addition and Subtraction Strategies

Which two related addition facts can help you solve 13 – 7?

• 7 + 6 = 13

• 7 + 13 =20

• 6 + 7 = 13

• 6 + 1 = 7

• 7 + 9 = 16

A part is missing in the equations. Find the missing part.

4 + ______ = 7

7 – 4 = ______

• 11

• 2

• 12

• 3

Choose the question that give  you 15

• 11 - 1 + 5

• 20 - 10 + 10

• 10 + 6

• 19 - 8

What number goes on the line?

900 + 80 + ____ = 986

• 6

• 8

• 9

• 60

What number is missing?

4000 + 300 + ___ + 2 = 4,362

• 2

• 60

• 3

• 40

What number goes in the blank?

10 - ____ = 6

6 + _____ = 10

• 4

• 5

• 6

• 10

Which equation has the same total as 64 + 24?

• 60 + 20 + 4 + 4 = 88

• 60 + 40 + 2 + 4 = 106

• 60 + 20 + 2 + 4 = 86

• 70 + 20 + 3 + 3 = 96

What does 85 - 39 equal?

• 44

• 46

• 54

• 56

Mark subtracted 842 − 63 like this. Is Mark correct?

• Mark's answer is correct. He set up the problem the right way.

• Mark's answer is not correct. He set up the problem right but subtracted wrong

• Mark's answer is correct, but he set up the problem wrong.

• Mark's answer is not correct, because he set up the problem wrong.

Sal is subtracting 273 from 368 using base ten blocks. What does he need to do after subtracting the ones?

• Trade 1 hundred for 10 tens.

• Trade 6 tens for 60 ones.

• Trade 2 hundreds for 20 tens

• Trade 1 ten for 10 ones.