There are nine tens in ninety one.
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There are 90,000 (ninety thousand) tens.
six hundred and ninety-three6,930 / 10 = 693
There are 100 tens in one thousand.
there are 100 tens in 1000
7 tens and 20 ones is 7 × 10 + 20 × 1 = 70 + 20 = 90 (ninety).