Generally, when spelt out in words in English, you hyphenate the numbers between 20 and 99 which have digits other than 0 in the units column - for example, twenty-one, twenty-two, twenty-three.... ninety-eight, ninety-nine.
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All numbers between 21 and 99 are not hyphenated, except for the multiples of ten (30, 40, 50, etc.)
-99
There are 900 three-digit numbers, all of which are between 99 and 3,000.
15 + 17 + 19 = 3 x 17 = 51
8 ... they are 20, 30, 40, etc on up to 90
88