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In numbers from 13 to 19 use -teen at the end of the word: thirteen, forteen, etc.

In numbers from 20 to 90 use -ty at the end of the word: twenty, thirty, etc.

Between two numbers use "-": twenty-one, thirty-six, fifty-nine, etc.

21 + 7 = [ ].

1. 33 − 2 = [ ].
2. 49 + 1 = [ ].
3. 40 − 6 = [ ].
4. 19 + 2 = [ ].
5. 50 + 3 = [ ].