80
7 tens and 20 ones is 7 × 10 + 20 × 1 = 70 + 20 = 90 (ninety).
10 or 5
99
To find 6 tens more than 20, you first need to convert 20 to tens, which is 2 tens. Then, add 6 tens to that, which equals 8 tens. Converting 8 tens back to a standard number, you get 80. Therefore, 6 tens more than 20 is 80.
yes
310
9,870
The number that is 2 tens (or 20) more than 71 is 91.
13 tens is the same as 13 x 10 which equals 130.
20 and 30
Tens of quintillions.