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7 tens and 20 ones is 7 × 10 + 20 × 1 = 70 + 20 = 90 (ninety).
10 or 5
310
9,870
13 tens is the same as 13 x 10 which equals 130.
Tens of quintillions.
20 and 30
2 tens, which is twenty.
74
there are 200 tens in two hundred
20 is already rounded to the nearest tens.
20 + 6 tens = 20 + 60 = 80