Selina Concise Class 6 Math Chapter 15 Decimal Fractions Exercise 15C Solution
EXERCISE 15C
(1) Multiply:
(2) Evaluate:
(3) Multiply each of the following numbers by 10, 10 and 1000:
(i) 3.9 × 10 = 39, 3.9 × 100 = 390, 3.9 × 1000 = 3900
(ii) 2.89 × 10 = 28.9, 2.89 × 100 = 289, 2.89 × 1000 = 2890
(iii) 0.0829 × 10 = 0.829, 0.0829 × 100 = 8.29, 0.0829 × 1000 = 82.9
(iv) 40.3 × 10 = 403, = 40.3 × 100 = 4030, 40.3 × 1000 = 40300
(v) 0.3725 × 10 = 3.725, 0.3725 × 100 = 37.25, 0.3725 × 1000 = 372.5
(4) Evaluate:
(5) Divide each of the following numbers by 10, 100 and 1000:
(i) 49.79 ÷ 10 = 4.979, 49.79 ÷ 100 = 0.4979, 49.79 ÷ 1000 = 0.04979
(ii) 0.923 ÷ 10 = 0.0923, 0.923 ÷ 100 = 0.00923, 0.923 ÷ 1000 = 0.000923
(iii) 0.0704 ÷ 10 = 0.00704, 0.0704 ÷ 100 = 0.000704, 0.0704 ÷ 1000 = 0.000704
(6) Evaluate:
(7) Fill in the blanks with 10, 100, 1000 or 10000, etc:
(i) 7.85 × 10 = 78.5
(ii) 0.442 × 1000 = 442
(iii) 0.0924 × 100 = 9.24
(iv) 0.00187 × 10000 = 18.7
(v) 2.6 × 1000 = 2600
(vi) 0.08 × 1000 = 80
(vii) 96.7 ÷ 100 = 0.967
(viii) 5.2 ÷ 10 = 0.52
(ix) 33.15 ÷ 1000 = 0.03315
(x) 0.7 ÷ 1000 = 0.007
(xi) 0.00672 ÷ 10000 = 67.2
(8) Evaluate:
(i) 9.32 – (28.54 ÷ 10)
= 9.32 – 2.854
= 6.466
(ii) (0.234 × 10) + 62.8
= 2.34 + 62.8
= 65.14
(iii) (3.06 × 100) – (889.4 ÷ 100)
= 306 – 8.894
= 297.106
(iv) (2.86 × 7.5) + (45.4 ÷ 0.2)
= 21.45 + 227
= 248.45
(v) (97.82 × 0.03) – (0.54 ÷ 0.3)
= 2.9346 – 1.8
= 1.1346