Mathematics · Quantitative Aptitude

Number Operations and Properties

974 Questions

Improve your quantitative aptitude with these number operations and properties questions. The topics range from basic subtraction and division to highest common factor and roman numerals. Regular practice of these fundamentals builds speed for exams.

Basic arithmetic operationsHCF and number propertiesRoman numeral calculationsNumber series evaluation

Number Operations and Properties Questions

Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

A boy was asked to multiply a certain number by 25 He multiplied it by 52 and got his answer more by 324 than the correct answer The number to be multiplied was

  1. 15

  2. 12

  3. 18

  4. 23

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the number is x

The if be multiply by 25 then correct answer =25x 
But boy multiply with 52 then boys answer =52 x
As per question boy answer if more then 324 than correct answer 
$\therefore 52x=25x+324$
$\Rightarrow 52x-25x=324$
$\Rightarrow 27x=324$
$\Rightarrow x=12$