You can't subtract 15 ones from 15 tens. The bills are all tens, so you'd have to get change first. Then you'd be subtracting 15 ones from 13 tens and 20 ones, or from 13 tens, one 5, and 15 ones.
15 638 can be made with 1 ten, 5 ones, 6 hundreds, 3 tens, and 8 ones; 1 ten, 8 ones, 6 hundreds, 3 tens, and 5 ones; or 6 ones, 5 hundreds, 3 tens, 8 ones, and 1 ten.
150 - 15 = 135
1744
1
You can't subtract 15 ones from 15 tens. The bills are all tens, so you'd have to get change first. Then you'd be subtracting 15 ones from 13 tens and 20 ones, or from 13 tens, one 5, and 15 ones.
15 638 can be made with 1 ten, 5 ones, 6 hundreds, 3 tens, and 8 ones; 1 ten, 8 ones, 6 hundreds, 3 tens, and 5 ones; or 6 ones, 5 hundreds, 3 tens, 8 ones, and 1 ten.
(9*10)+(15*1) = 105
96
the tens place is on the left for example the # 15 1 is the tens and 5 is the ones
150 - 15 = 135
If I'm figuring this correctly, 16*10 = 160 and 15*1 = 15, so 160 + 15 = 175.
1744
1
3200 + 150 + 9 + 0.1 + 0.04 = 3359.14
1765
Well, honey, if you've got 15 tens, you've got yourself the number 150. It's as simple as that. No need to overcomplicate things, just count those tens and you'll have your answer.