5, 10, 15 any multiple of 5
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12 + 10 = 22
Ten times nine equals ninety.
Ten times eleven equals one hundred ten.
400 x 10
VII is twelve in Roman Numerals because 'V' equals ten, 'I' equals one, there are two 'I's which is the same as 1+1 which equals two, and there is a ten and a two so 10+2 equals 12 and that is how you figure out what the Roman Numeral number is.