Tag: knowing our numbers

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Questions Related to knowing our numbers

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