Decimal Numbers Quiz Set 014 | Maths Aptitude Mock Test on Decimals and Floating Point Numbers Set 14 | mock tests for Bank PO, SSB/SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

What is ${5.32^2 - 5.65^2}/{5.32 - 5.65}$?

10.97.

+0.33.

-10.97.

-.33.

Soln.
Ans: a

We know $a^2 - b^2$ = $(a - b) × (a + b)$. So ${a^2 - b^2}/{a - b}$ is same as a + b. We get a + b = 5.32 + 5.65 = 10.97.

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Question 2

What is y in $7.907 + 0.7 + y = 0.06$?

-8.547.

+8.547.

-7.547.

+7.547.

Soln.
Ans: a

y = 0.06 - (0.7 + 7.907) = -8.547.

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Question 3

664945 is same as?

$6.64945 × 10^{5}$.

$6.64945 × 10^{4}$.

$6.64945 × 10^{6}$.

$6.64945 × 10^{3}$.

Soln.
Ans: a

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Question 4

What is ${3.39^3 - 0.20^3}/{3.39^2 + 0.678 + 0.20^2}$?

3.19.

4.19.

5.19.

2.19.

Soln.
Ans: a

We know ${a^3 - b^3}/{a^2 + ab + b^2}$ is same as ${(a - b) × (a^2 + ab + b^2)}/{a^2 + ab + b^2}$ which is same as a - b. So we get a - b = 3.39 - 0.20 = 3.19.

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Question 5

What is ${42 × 1.9 - 68 × 5.2}/9.1$?

$-30{8/91}$.

$-30{7/91}$.

$-30{6/91}$.

$-30{9/91}$.

Soln.
Ans: a

Observe that all fractional numbers are having one digit to the right of the dot. So we can cancel all the dots and get a plain expression: ${42 × 19 - 68 × 52}/91$ which equals ${-2738/91}$, which is same as: $-30{8/91}$

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