Which Roman numeral represents the number 70?

The Roman numeral representation of the number 70 is LXX. In Roman numerals:

• The letter 'L' represents 50.

• The letter 'X' represents 10, so when you see 'XX' following 'L', it indicates an additional 20 (10 + 10) is being added to 50.

Therefore, when you combine them, L (50) + XX (20) = 70. This understanding of how Roman numerals are constructed is crucial, as they often combine various letters to create different values.

In contrast, the other options represent different numbers:

• The numeral 'XLV' equates to 45 (50 - 10 + 5).

• The numeral 'LIX' represents 59 (50 + 9).

• The numeral 'LIV' equals 54 (50 + 4).

This basic knowledge of Roman numeral values helps clearly identify that LXX is indeed the correct representation for 70.