Answer:
Step-by-step explanation:
You could start from 100 and keep on subtracting 3 until you hit a number that is less than 10.
That's the long way. You could use some algebra, and do the same thing
100 - 3n = start with -9 That would be the first possible single digit.
100 - 3n = - 9 Subtract 100 form both sides
- 3n = -9 - 100
-3n = - 109 -109 is not divisible (evenly) by -3
Start again
100 - 3n = - 8
-3n = - 108 That's the answer. Divide by -3
n = -108 / - 3
n = 36
So you would have to make 36 subtractions until you hit a result that is divisible by -3