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