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Grade 2 - Mathematics
1.42 Adding and Subtracting 9 Mentally
Method
:
Read out the equations given.
9 can be written as 10-1.
Example
: 43-9
We can write this as 43-10+1
Answer : 34
.
Example
: 53+9
We can write this as 53+10-1
Answer : 62
Directions:
Find the missing number. Also write atleast 5 examples of your own.
Q 1
: 71 + 9 = ? (Hint: 71+10-1)
79
81
80
82
Q 2
: 54 + 9 = ? (Hint: 54+10-1)
62
65
63
64
Q 3
: 38 + 9 = ? (Hint: 38+10-1)
46
48
49
47
Q 4
: 28 - 9 = ? (Hint: 28-10+1)
19
18
15
17
Q 5
: 31 - 9 = ? (Hint: 31-10+1)
21
22
20
23
Q 6
: 47 - 9 = ? (Hint: 47-10+1)
38
39
36
37
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Question 8: This question is available to subscribers only!
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