Exploring Break Apart Ones in 2nd Grade Math

Which of the following pairs of numbers add up to 7?

• 6 and 2

• 5 and 3

• 4 and 3

• 3 and 5

What do you notice about the addends as one number decreases?

• The other addend decreases

• The other addend increases by one

• The sum changes

• The addends remain the same

Which of the following pairs of numbers add up to 8?

• 7 and 1

• 6 and 3

• 5 and 4

• 4 and 5

Why do we break apart a number to make subtraction easier?

• To make the number a multiple of 10

• To make the number a multiple of 5

• To make the number larger

• To make the number smaller

What is 63 minus 7 when broken into two parts?

• 60 and 4

• 56 and 7

• 50 and 7

• 60 and 3

How do you break apart 55 minus 8?

• 5 and 3

• 4 and 4

• 5 and 5

• 6 and 2

If Cheryl brought 27 bagels and Mike brought 24, how many did they sell if 9 were left?

• 42

• 51

• 33

• 45

Lexi has 8 fewer crayons than Ken, who has 45. How many crayons does Lexi have?

• 37

• 38

• 35

• 36

If Samuel had 46 marbles and gave some away, leaving him with 9, how many did he give away?

• 36

• 38

• 37

• 35

Matthew had 73 blocks and gave 8 to his sister. How many blocks does he have now?

• 67

• 66

• 64

• 65