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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
: 23 + 9 = ? (Hint: 23+10-1)
32
33
31
35
Q 2
: 47 - 9 = ? (Hint: 47-10+1)
39
37
38
36
Q 3
: 38 + 9 = ? (Hint: 38+10-1)
46
47
48
49
Q 4
: 62 - 9 = ? (Hint: 62-10+1)
54
52
53
51
Q 5
: 54 + 9 = ? (Hint: 54+10-1)
63
64
65
62
Q 6
: 31 - 9 = ? (Hint: 31-10+1)
20
21
22
23
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