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Lesson 7 - Using Mental Math to Subtract



 1. 

Use mental math to calculate.

       56 - 21
a.
35
b.
36
c.
31
 

 2. 

Use mental math to calculate.

       78 - 37
a.
47
b.
38
c.
41
 

 3. 

Use mental math to calculate.

       81 - 13
a.
61
b.
68
c.
63
 

 4. 

Use mental math to calculate.

       38 - 12
a.
22
b.
28
c.
26
 

 5. 

Use mental math to calculate.

       95 - 38
a.
57
b.
55
c.
58
 

 6. 

Tristan has 62 comic books. He sells 17. How many comic books does he have left?
a.
42
b.
45
c.
47
 

 7. 

Jennifer has 38 apples. She uses 16 to make apple pies. How many apples does she have left?
a.
22
b.
28
c.
26
 

 8. 

Colin has 83 pennies. He uses 25 pennies to buy a muffin at the bake sale. How many pennies does he have left?
a.
53
b.
55
c.
58
 

 9. 

Erin has 78 marbles. She loses 23. How many does she have left?
a.
55
b.
58
c.
53
 

 10. 

Sam has 63 loonies. He gives 12 loonies to the charity run and uses 5 loonies for water bottles. How many loonies does he have left?
a.
51
b.
46
c.
58
 



 
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