Test: Digits And Rounding Off - GRE MCQ

If the final result is less than 1.3, it means that the result is 1.2. If the result is 1.2, the previous digit has been kept the same. According to the rounding off rules, to keep the previous digit the same, the next digit should be less than 5. d can be 0, 1, 2, 3 or 4. The answer is C

0.0064/0.04 = (64/10000)/(4/100)
= (64/10000) * (100/4)
= 16/100
= 0.16

The answer is B

for 2.134 × 10x is less than 210,000 to remain true, the greatest number is 21,340, which makes x=4
 

234,567 ÷ 10³ = 234.567. 

According to the rounding off rules, to round off to the nearest integer, look for the first digit after decimal point. The first digit after the decimal is 5 (which is more than equal to 5) so the answer would be 235. The answer is B.

To find the value of 10 - x, find the value of a and b.

Considering statement (1) alone: 
10 - x = 8.66

⇒ x = 10 - 8.66 

⇒  x = 1.34
Comparing this value with 1.3ab8, the only information we get is that a can be either 3 or 4. Insufficient

Considering statement (2) alone:
10 - x = 8.664

⇒  x = 10 - 8.664  

⇒ x = 1.336
Comparing this value with 1.3ab8, it can be infered that a = 3 and b = 5 (using the rules of rounding off).  Sufficient

The answer is A.

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