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 roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Write $39$ in roman numbers

  1. XXXIX

  2. XXXXI

  3. XXXX

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
To convert $39$ to Roman Numerals we need to split it up into place values (ones, tens, hundreds, etc.), like this:

Place Value Number Roman Numeral
Tens            $30$ $XXX$
Ones               $9$ $IX$


Please note, we skipped place values that equal 0.

You then combine them all together (starting from the top) to get $XXXIX.$
So option A is the correct answer.

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

The product obtained when $13$ is multiplied by $7$(in roman number ) is 

  1. XXCI

  2. LXI

  3. XCI

  4. CI
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 $13\times 7=91$
Break the number $91$ (decompose it) into place value subgroups: 
$91 = 90 + 1;$

Convert each subgroup: $90 = 100 - 10 => C - X = XC; 1 = I;$

Wrap up the Roman numeral: 
$91 = 90 + 1 = XC + I = XCI;$
$ XCI$ is a group of numerals in additive and subtractive notation which will be $91.$

So option C is the correct answer.
Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

IX + XV + XX = ______

  1. 45

  2. 35

  3. 44

  4. 40
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Roman numerals are represented by the following letters:

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

If a numeral is followed by another numeral of lower denomination, the two are added together;

if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

 

9 + 15 + 20 = 44

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Numeral for $CCCXLVII$

  1. $357$
  2. $347$
  3. $367$
  4. $387$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Roman numerals are represented by the following letters:

$I = 1$

$V = 5$

$X = 10$

$L = 50$

$C = 100$

$D = 500$

$M = 1000$

If a numeral is followed by another numeral of lower denomination, the two are added together;

if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

CCCXLVII
$100 + 100 + 100 + 40 + 7 = 347$

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

The product obtained when 13 is multiplied by 7 is

  1. XXCI

  2. LXI

  3. XCI

  4. CI
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Roman numerals are represented by the following letters:

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

If a numeral is followed by another numeral of lower denomination, the two are added together;

if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

 

13 $\displaystyle \times $ 7 = 91
91 $\displaystyle \rightarrow $ XCI