What number is XXII?

Transformers Revenge of the fallen
22.
In the Roman numeric system, symbols are given value. For example, I = 1, V = 5 and X = 10. So in this case, XXII is equal to 22 (X = 10, X =10, I = 1, I =1).

The symbols that held numeric are I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.
When converted into Roman numerals 22 = XXII
22 , twenty-two ,
22
XXII = 22
XXII is 22.

It is: XXII = 22
Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger ones.

→ XXII = 10 + 10 + 1 + 1 = 22