OK, SO 24 - 5 is 19, but how you get there is you count down so 24, 23, 22, 21, 20, 19. You can also do it by setting up a problem:
24
- 5
____
OK,
SO You can't subtract 5 from 4 and get a positive number, you would get -1. So you borrow. Subtract 1 from the 2 in the tens place and bring that ten to the 4 temporarily to get 14. Then subtract 5 from 14, so 13, 12, 11, 10, 9 and put a 9 under than column. Then, subtract that one from 2 that you took, and your answer is 19! Hope this helps!
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Subtract 7/24 from 4/8 to get 5/244/8 * 3/3 = 12/2412/24 -5/24 = 7/24
24/30 - 5/30 = 19/30
If you mean 8 and 7/12 subtract 2 and 3/8 then it is 6 and 5/24
24
The inverse operation for subtract 5 is add 5. This is because whatever number you start with, if you first "subtract 5" and then "add 5" or if you first "add 5" and then "subtract 5" you are back to the number you started with.