DECIMAL FRACTIONS - EXERCISE 3 (SOLUTION 61 TO 70)

61.  0.2 + 0.3 + 0.4 + 0.9 + 0.39 = (2/9 + 3/9 + 4/9 + 9/9 + 39/99) = (9/9 + 9/9 + 39/99) = 2  13/33

62.  2.87 – 2.59 = (3 + 0.97) –( 2 +0.59) = (3 + 87/99) – ( 2 + 59/99) = 1 + (87/99 – 59/99)

     = 1 + 28 / 99 = 1.28.

63.  3.36 – 2.05 + 1.33 =[(3 + 0.36 ) + ( 1 +0.33)] – ( 2 +0.05)

=[4 + (36/99 + 33/99)] – [ 2 + 5/99] = 2 + (36/99 + 33/99 – 5/99) = 2 + 64/99 = 2.64.

64.  0.09 x 7.3 =9/99 x 7 3/9 = 1/11 x 66/9 = 2/3 =0.6.

65.  0.3467 + 0.1333 = 3467 – 34  / 9900 +1333 – 13 / 9900 = 3433 + 1320/9900 =4753/9900 = 4801 – 48 /9900 = 0.4801

66.  (8.31 + 0.6 + 0.002 ) = 8 +31 – 3 /90 +6/9 + 2/900 = 7200 + 280 + 600 + 2 /900

= 8082/900 = 8 882/900 = 8 + 979 – 97 /900 = 8.979.

67.  2.75 + 3.78 = (-2 +0.75) + ( -3 +0.78 ) = -5 + (0.75 + 0.78 ) = - 5 + 1.53.

= -5 + 1 + 0.53 = - 4 + 0.53 = 4.53.

68.  547527/82 = 54.7527/0.0082 = (547.527/0.0082 x 1/10 ) = X /10.

69.  29.94/1.45= 299.4/14.5 = (2994/14.5 x 1/10) = 172/10 = 17.2

70.  1.6 x 21.3 = (16/10 x 213/10) = (16 x 213/100) = 3408/100 = 34.08.