Question 418349
10 = X
20 = XX
30 = XXX
40 = XL

1 = I
2 = II
3 = III
4 = IV
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX

Combine the tens and units placeholders together to obtain any number. For example, 26 in Roman numerals is XXVI.