8 (sum means add 2x10 +10x2 =40 then divide by 5 to find the amount of fives that fit=8)
9
0.15 of them
Twenty of them.
it is 1 7 tens 1 fives
13 tens is the same as 13 x 10 which equals 130.
9
10
0.15 of them
480
If you have 20 tens you have 200. You don't need the rest.
Twenty of them.
35
it is 1 7 tens 1 fives
5/10 is greater
13 tens is the same as 13 x 10 which equals 130.
7.351
17 tens = (10 + 7) tens = 10 tens + 7 tens = 1 hundred + 7 tens.