It took me 3 times to get it, but it totally makes since now. That guy just multiplied backwards. 7 does go into 28, 13 times if you multiply it in reverse. This also works with 3 and 15. 3 will not go into 1, so we will save the 1 for later. Now we subtract 3 from 5 and we get 2. Now we are going to use the one, we’ll put it in front of the 2, and we get 12. 3 goes into 12, 4 times, so this equals 14. 3 goes into 15, 14 times.

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