Answer:
(Going from left to right)
Box #1=3
Box #2=5
Box #3=7
Box #4=2
Step-by-step explanation:
For Box #4, there is nothing for the 2 to subtract from so it just goes down
For Box #3, it has to be 7, because nothing can be subtracted from 1 to get 3, so you would have to bring a 1 from the 4 to the left to make the 1 to a 10. 10-7=3
For Box #2 and 1, 3(we changed it in the last step) -9 = a negative number so we have to bring a 1 from the number to the left. This is a hard step but what you have to do it look at the bottom number, which is a 2, so that number had to be a 3 because 3-1=2. 4 becomes 14, and 14-9=5
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