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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.)

Q: What numbers between 20 and 99 are not hyphenated?

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-99

There are 900 three-digit numbers, all of which are between 99 and 3,000.

8 ... they are 20, 30, 40, etc on up to 90

15 + 17 + 19 = 3 x 17 = 51

88

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Every integer from 20 to 99 qualifies; therefore there are 99 - 19 or 80 such numbers.

In general, the numbers form 21-99 are hyphenated; ninety-seven

There are 49 even numbers between 1 and 99.

First number is 20 and last is 99 so 20 = 1 then 21 = 2 then 29 = 10 So from 29 take 19 to make 10 then apply to 99 as in 99 - 19 = answer 80

-99

99

It is hyphenated, as asked, eighty-four. Numbers from 21 to 99 are hyphenated when spelled out, as are combined ordinal forms such as one hundred-thousandth, one fifty-fifth, and so forth.

There are 900 three-digit numbers, all of which are between 99 and 3,000.

There are 99 numbers between 0 and 100.

8 ... they are 20, 30, 40, etc on up to 90

15 + 17 + 19 = 3 x 17 = 51

There are 900 three digit numbers between 99 and 3,000 - ranging from 100 to 999