Selina Concise Class 7 Math Chapter 4 Decimal Fractions Exercise 4B Solution
EXERCISE 4B
(1) Add:
(2) Subtract the first number from the second:
(3) Simplify:
(i) 28.796 – (13.42 + 2.555)
= 28.796 – 15.975
= 12.821
(ii) 93.354 – (62.82 + 13.045)
= 93.354 – 75.865
= 17.489
(iii) 36 – (18.59 + 3.2)
= 36 – 21.79
= 14.21
(iv) (86 + 16.95) – 3.0042
= 102.95 – 3.0042
= 99.9458
(v) 32.8 – 13 – 10.725 + 3.517
= (32.8 + 3.517) – (13 + 10.725)
= 36.317 – 23.725
= 12.592
(vi) 4000 – (30.51 + 753.101 + 69.43)
= 4000 – 853.041
= 3146.959
(vii) 0.1835 + 163.2005 – (25.9 + 100)
= 163.384 – 125.9
= 37.484
(viii) 38.00 – 30 + 200.200 – 0.230
= (38.00 + 200.200) – (30 + 0.230)
= 238.2 – 30.23
= 207.97
(ix) 555.555 + 55.555 – (5.55 + 0.555)
= 611.11 – 6.105
= 605.005
(4) 6.85 – 0.685 = 6.165
(5) 200.111 – (19.38 + 56.025)
= 200.111 – 75.405
= 124.706
(6) (13.95 + 1.003) – (2.794 + 6.2)
= 14.953 – 8.994
= 5.959
(7) 80.375 – 39.587
= 40.788
(8) 100 – 19.29
= 80.71
(9) 584.29 – 213.95
= 370.34
(10) Evaluate:
(i) (5.4 – 0.8) + (2.97 – 1.462)
= 4.6 + 1.508
= 6.108
(ii) (6.25 + 0.36) – (17.2 – 8.97)
= 6.61 – 8.23
= – 1.62
(iii) 9.004 + (3 – 2.462)
= 9.004 + 0.538
= 9.542
(iv) 879.4 – (87.94 – 8.794)
= 879.4 – 79.146
= 800.254
(11) 75 – 48.29
= 26.71
(12) (i) A – B
= 237.98 – 83.47
= 154.51
(ii) B – A
= 83.47 – 237.98
= – 229.633
(13) Increases amount in cost
= Rs (32.65 – 28.47)
= Rs 4.18