Page 36 - Maths Skills - 7

34 Maths

Let’s Attempt

Example 1: Find the quotient: 72.0 ÷ 0.8. Fact-o-meter
Solution: 72.0 ÷ 0.8 = 720 ÷ 8
Shift the decimal point in both divisor and dividend by one For divisions involving
place to the right and fill in the vacant ones place in the decimal numbers, first
dividend by placing a 0 there. Now, perform the division. count the number of
decimal places in the
8) 720 (90 divisor.
–72
0
Thus, 72 ÷ 0.8 = 90.

Example 2: Find the quotient: 122.32 ÷ 11. Example 3: Find the quotient: 4.096 ÷ 1.6.
Solution: 11) 122.32 (11.12 Solution: 4.096 ÷ 1.6 = 40.96 ÷ 16
– 11 The decimal point is moved by one place to the
12 right in the divisor and so in the dividend.
– 11
13 16) 40.96 (2.56
– 11 – 32
22 89
– 22 – 80
0 96
– 96
Thus, 122.32 ÷ 11 = 11.12. 0

Thus, 4.096 ÷ 1.6 = 2.56.

Exercise 2.4

1. Multiply.

(i) 3.6 × 8 (ii) 6.65 × 1.6 (iii) 3.82 × 2.6 (iv) 165.2 × 1.2
(v) 2.88 × 3.2 (vi) 3.65 × 2.4 (vii) 2.65 × 3.12 (viii) 7.65 × 7.1
(ix) 2.862 × 0.1 (x) 31.76 × 2.8 (xi) 312 × 0.02 (xii) 718 × 1.002

2. Perform the following divisions.
(i) 16.8 ÷ 4 (ii) 200.01 ÷ 3 (iii) 13.31 ÷ 11 (iv) 1.76 ÷ 16

(v) 0.3666 ÷ 60 (vi) 500.25 ÷ 15 (vii) 0.056 ÷ 8 (viii) 0.588 ÷ 14
3. Write the products.

(i) 7.12 × 10 = ___________ (ii) 7.68 × 100 = ___________
(iii) 0.0052 × 1000 = ___________ (iv) 7.1285 × 1000 = ___________

(v) 2.8362 × 100 = ___________ (vi) 0.7812 × 100 = ___________
4. Perform the following divisions.
(i) 2.24 ÷ 1.6 (ii) 0.408 ÷ 0.17 (iii) 6.25 ÷ 2.5 (iv) 1.331 ÷ 0.11