Answer: 101.00027

Explanation:
101 27/100000 = 101 + 27/100000 = 101 + .00027 = 101.00027

Answer: 6

Explanation:
Sum of decimal places = 7.
Since the last digit to the extreme right will be zero (since 5 x 4 = 20), so there will be 6 significant digits to the right of the decimal point.

Answer: (0.2)2

Explanation:
1 ÷ 0.2 = 1/0.2 = 10/2 = 5;

0.2 = 0.222...;
(0.2)² = 0.04.
0.04 < 0.2 < 0.22....<5.
Since 0.04 is the least, so (0.2)² is the least.

Answer: 4/5 , 7/9 , 5/7 , 2/3

Explanation:
2/3 = 0.66 ; 5/7 = 0.71 7/9 = 0.77 ; 4/5 = 0.8
Hence, the descending order is: 4/5 , 7/9 , 5/7 , 2/3

Answer: 20.0115

Explanation:
(12.1212 + 17.0005) – 9.1102 (29.1217 – 9.1102) = 20.0115

Answer: 224.777

Explanation:
(892.7 – 573.07 – 95.007) = 224.777

Answer: 47.95

Explanation:
Let 3889 + 12,952 – x = 3854.002
Then, x = (3889 + 12.952) – 3854.002 = 3901.952 – 3854.002 = 47.95

Answer: None of these

Explanation:
Let 832.58 – 242.31 = 779.84 – x
Then x = (779.84 + 241.31) -832.58 = 1022.15 – 832.58 = 189.57

Answer: 8

Explanation:
Let x + 543 + 5.43 = 603.26
Then x = 603.26 – (543 + 5.43) = 603.26 – 548.43 = 54.83
Hence the missing digit is 8.

Answer: 5.18 * 108                     

Explanation:
51,80,00,000 = 5.18 * 100000000 = 5.18 * 108