S. K. Gupta Anubhuti Gangal Class 5 Math Eighth Chapter Decimals Exercise 31

S. K. Gupta Anubhuti Gangal Class 5 Math Eighth Chapter Decimals Exercise 31

EXERCISE 31

Multiply:

(1) 1.13 × 0.7

= 0.791

(2) 21.05 × 0.8

= 16.84

(3) 19.2 × 0.003

= 0.0576

(4) 0.004 × 1.3

= 0.0052

(5) 83.7 × 5.9        

= 493.83

(6) 89.65 × 6.8

= 609.62

(7) 1.57 × 0.018

= 0.02826

(8) 1.035 × 16.3     

= 16.8705

(9) 23.02 × 49.3

= 1134.886

(10) 25.3 × 16.7

= 422.51

(11) 0.3 × 0.4 × 0.02

= 0.3 × 0.008

= 0.0024

(12) 0.02 × 0.03 × 0.0001

= 0.02 × 0.00003

= 0.00000006

(13) 0.1 × 0.02 × 0.003 × 0.004

= 0.1 × 0.02 × 0.000012

= 0.1 × 0.0000024

= 0.000000024

(14) 39.8 × 400

= 15920

(15) 65.12 × 7000

= 455840

(16) If 59 × 8.7 = 513.3, find the product in each of the following without multiplication.

(a) 5.9 × 8.7

= 51.33

(b) 5.9 × 87

= 513.3

(c) 0.59 × 87

= 51.33

(d) 0.59 × 8.7

= 5.133

(e) 0.59 × 0.87

= 0.5133

(f) 5.9 × 0.87

= 5.133

(g) 0.059 × 0.0087

= 0.0005133

(17) Alok weighs 50.87kg. His father is 1.5 times heavier than he is. Calculate his father’s weight.

Solution: the required weight of Alok’s father (in kg) = (50.87 × 1.5) =76.305 kg.

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