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Lesson 6 - Using Mental Math to Add



 1. 

Use mental math to calculate.

        18 + 24
a.
42
b.
38
c.
44
 

 2. 

Use mental math to calculate.

        53 + 12
a.
63
b.
67
c.
65
 

 3. 

Use mental math to calculate.

        73 + 22
a.
95
b.
92
c.
93
 

 4. 

Use mental math to calculate.

        38 + 41
a.
78
b.
79
c.
81
 

 5. 

Use mental math to calculate.

       68 + 14
a.
84
b.
76
c.
82
 

 6. 

Ananda is baking cookies for the school bake sale. She bakes 38 chocolate chip cookies and 26 oatmeal cookies. How many cookies does Ananda bake in total?
a.
66
b.
68
c.
64
 

 7. 

During a family trip to Banff National Park, Craig counts the number of red cars he sees. He sees 42 on the way there and 36 on the way back. How many red cars does he see in total?
a.
78
b.
76
c.
72
 

 8. 

Angela is collecting loonies for a charity walk. Before the walk she collects 62 loonies. After the walk she collect 15 loonies. How many loonies does she collect altogether?
a.
77
b.
75
c.
72
 

 9. 

Dana places 38 quarters in a jar. The next day she places another 21 quarters in the jar. What is the total number of quarters in the jar?
a.
61
b.
59
c.
58
 

 10. 

Marian picked 27 ears of corn on Monday, 32 ears of corn on Tuesday, and 14 ears of corn on Wednesday. How many ears of corn did Marian collect in total?
a.
46
b.
59
c.
73
 



 
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