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39 / 9 = 4 + 1/3 So 9 can be subtracted from 39 4 times.
As many times as you feel like it before you get bored and stop.After 13 times, you will be left with zero, and you'll begin going into negative numbers.Bu that should be no problem for you.
3 times 3 x 13 = 39
Twice
39 ÷ 3 = 13