Question

Find the number corresponds to XXI in Hindu-Arabic numerals.

• A. 21

Answer 1

The correct option is A 21
We know that X = 10 and I = 1.
If a symbol of smaller value is written to the right of a symbol of greater value in Roman numeral, then the values are added.

XXI = X + X + I
XXI = 10 + 10 + 1
XXI = 21

So, number corresponds to XXI in Hindu-Arabic numerals is 21.