If this is a riddle, the answer is "only once, because after that you have only 879 to subtract from". Otherwise, you can subtract 8 lots of 121 from 1000.
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121/2 = 60.5 times.
It goes into 121 15 times with a remainder of 1
121 ÷ 9 = 13 4/9 ≈ 13.444
No
4 times with a remainder of 21