Practice the set of questions provided in the worksheet on adding and subtracting 2digit numbers.
1. Find the sum and subtraction result as the case may be of the following:
(i) 55 + 35 = 55 + 30 + 5
= 55 + 5 + 30
= 60 + 30
= 90
(ii) 90 – 35 = 90 – 30 – 5
= 60 – 5
= 55
(iii) 45 + 25 = 45 + 20 + 5
= 45 + 5 + 20
= 50 + 20
= ______
(iv) 30 – 15 = 30 – 10 – 5
= 20 – 5
= ______
(v) 60 – 35 = 60 – 30 – 5
= 30 – 5
= ______
2. Complete the diagram finding the sum and subtraction result:
(i)
(ii)
(iii)
3. Fill in the blanks:
(i) 28 + 28 = …………
(ii) 32 – 32 = …………
(iii) 12 taken away from 27 = …………
(iv) Which is more, 49 – 1 or 39 – 1 …………?
(v) What should be added to 31 to make it 47 …………?
(vi) 41 + 1 = …………
(vii) 47 – 2 = …………
(vii) Which is more, 57 – 2 or 56 – 2 …………?
(ix) 23 taken away from 58 = …………
(x) What should be added to 63 to make it 80 …………?
(xi) Which is less, 25 + 4 or 27 – 4 …………?
(xii) 0 taken away from 34 = …………
(xiv) 22 + 17 = …………
(xv) What should be added to 11 to make it 45 …………?
Answers for the worksheet on adding and subtracting 2digit numbers are given below to calculate the two digit numbers mentally.
Answers:
1. (iii) 70
(iv)15
(v) 25
2. (i)
(ii)
(iii)
3. (i) 56
(ii) 0
(iii) 15
(iv) 49 – 1
(v) 16
(vi) 42
(vii) 45
(vii) 57 – 2
(ix) 35
(x) 17
(xi) 27 – 4
(xii) 34
(xiv) 39
(xv) 34
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