Decimal Fractions with Explanation
Q15. The number 518,000,000 when expressed in scientific notation, equals:
| A. 5.18 x 109 | B. 51.8 x 106 |
| C. 51.8 x 107 | D. 5.18 x 108 |
Q16. The value of 
is:
| A. 3.3 | B. 13.9 |
| C. 20 | D. 6.847 |
Q17. 12.1212 + 17.0005 - 9.1102 = ?
| A. 20.1015 | B. 20.0015 |
| C. 20.0115 | D. 20.105 |
Q18. What is decimal of an hour is a second?
| A. 0.0025 | B. 0.00027 |
| C. 0.000126 | D. 0.256 |
