Page 115 - Touchpad Mathematics V1.0 C1

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SuBtrACtion

Subtracting a 1-digit number From a 2-digit number

Example. Subtract 5 from 28.

Solution. We can use a number strip to find the answer.

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Find the bigger number, that is 28, on the number strip. Move backwards 5

places, you reach 23.
Thus, 28 - 5 = 23.

We can also use vertical subtraction to find the answer.

Step 1. Subtract the ones. Step 2. Subtract the tens.

T O T O

2 8 2 8
– 5 – 5

3 2 3

Thus, 28 - 5 = 23.

Exercise 7E

1. Solve the following using the number strips.

a. 39 – 4 = b. 43 – 2 = c. 37 – 5 = d. 38 – 6 =

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

e. 45 – 4 = f. 48 – 7 = g. 55 – 5 = h. 54 – 9 =

41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

i. 88 – 6 = j. 87 – 6 = k. 99 – 8 = l. 94 – 3 =

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

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Addition and Subtraction up to 100