Arithmatical - Decimal Fraction

DIRECTIONS : Problems based on Decimal Fraction.
1. What decimal of an hour is a second?
  A.  .0025
  B.  .0256
  C.  .00027
  D.  .000126
Solution
Required decimal = 1/ 60 x 60
= 1/ 3600
= .00027.
2. The value of (4.7×13.26 + 4.7×9.43+4.7×77.31) is
  A.  0.47
  B.  47
  C.  470
  D.  4700
Solution
Given expression= 4.7×(13.26+9.43+77.31)
= 4.7 ×100
= 470.

3. The value of (0.2×0.2+0.01) (0.1×0.1+0.02)-1 is equal to
  A.  5/3
  B.   9/5
  C.  41/4
  D.  41/12
Solution
Given expression(0.2×0.2+0.01)/ (0.1×0.1×+0.02)
= 0.04+0.01/0.01+0.02
= 0.05 / 0.03
= 5 / 3.
4. Which one of the following is equal to 3.14×106?
  A.  314
  B.  3140
  C.  3140000
  D.  None of these
Solution
Given, 3.14 ×106=3.140000×1000000
= 3140000.
5. 0.014×0.014= ?
  A.  0.000196
  B.  0.00196
  C.  19.6
  D.  196
Solution
Sum of decimals places= 6.
14×14= 196.
= s0.014×0.014
= 0.000196
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