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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.