7: has a value of 7 hundreds (or 700) 5: has a value of 5 tens (or 50) 6: has a value of 6 ones (or 6)
5 has a value of 50 or five tens
I believe you would draw this by drawing something that looks like place value blocks. I have attached an example of that. In the ones column, you will have 6 single blocks
The reason is because it is not just 6 it is - 6 so when there are two negative numbers they don't subtract they add if it was 6n then it was to be subtracted