Mathematics · Quantitative Aptitude

Number Operations and Properties

896 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 addition and subtraction vedic methods of multiplication vedic mathematics history of mathematics maths

Subtract $347657$ by $238294$ using vinculum numbers.

  1. $109363$
  2. $100363$
  3. $109373$
  4. $109563$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1) The first thing we do is write these numbers one on top of the other.

347657
238294

2) Now we just start subtracting vertically, and whenever our number is negative we represent it as a vinculum number.

347657
238294

3) This next subtraction is 7 – 8 = -1…so we just write this as 1 and continue on.

347657
238294
1 1 1 443

4) The ‘1‘ and ‘4‘ here are considered as two separate groups (since theres a non-vinculum number in-between them), so each is subtracted from 10. This has the effect of reducing the “previous one” by one.

109363

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

Three common multiples of $18$ and $6$ are 

  1. $18,6,9$
  2. $18,36,6$
  3. $36,54,72$

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Multiples of $ 18 = 18, 36, 54...$
Multiples of $ 6 = 6, 12, 18, ... $
The first common multiple will be $ 18 $
And the next common multiples will be multiples of $ 18 $
Hence, first three common multiples of $ 18, 6 $ are $ 18, 36, 54 $

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

The multiple(s) of $12$ is/are

  1. $12$
  2. $36$
  3. $4$

  4. All of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

$12\times 1=12$
$12\times 3=36$
$\therefore 12$ and $36$ are multiples,

 while $4$ is a factor of $12$
So, options $A$ and $B$ are both correct.

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

Multiple(s) of $14$ is/are

  1. $7$
  2. $1$
  3. $28$

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Multiples of $14$ are $14\times 1, 14\times 2$ ....
And $7$ and $1$ are the factors of $14$.

So, option $C$ is correct.

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

Which of the following is NOT a positive multiple of $12$?

  1. $3$
  2. $12$
  3. $24$
  4. $48$
  5. $60$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$3$ is not a positive multiple of $12$ as it is smaller than $12$.
Rest others are multiples of $12$.

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

Find the first four common multiples of the following : 

$3$ and $4$.

  1. $24, 28, 32, 36$
  2. $24, 27, 33, 36$
  3. $12, 24, 36, 48$
  4. $12, 15, 20, 24$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Multiples of $ 3 = 3, 6, 9, 12, 15, 18.. $
Multiples of $ 4 = 4, 8, 12, 16, 20.. $

The first common multiple will be $ 12 $

And the next common multiples will be multiples of $ 12 $

Hence, first four common multiples of $ 3, 4 $ are $ 12, 24, 36, 48 $

Multiple choice maths hcf-lcm introduction to multiples multiples lcm

Find the first four common multiples of the following :

$3, 4$ and $6$.

  1. $72, 78, 84, 90$
  2. $12, 24, 36, 48$
  3. $24, 30, 36, 42$
  4. $8, 12, 16, 21$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Multiples of $ 3 = 3, 6, 9, 12, 15, 18.. $
Multiples of $ 4 = 4, 8, 12, 16, 20.. $

Multiples of $ 6 = 6, 12, 18, 36.. $ 


The first common multiple will be $ 12 $

And the next common multiples will be multiples of $ 12 $

Hence, first four common multiples of $ 3, 4, 6 $ are $ 12, 24, 36, 48 $