Riddle answer : As many as you like -- (100-10) will always equal 90.
However, if it isn't a riddle, the answer would be 10 to reach 0. You could continue to subtract 10 an infinite number of times, yielding an increasing negative value.
As many times as you feel like it before you get bored and stop. After 10 times, you will be left with zero, and you'll begin going into negative numbers. Bu that should be no problem for you. I thought that it would be only once because then you are subtracting from the number 90 not 100.
10 times
5
Once! After you have subtracted it once, you are subtracting 100 from 1900, and then 100 from 1800 and on and on
10
The expression 10 - 5x 20 can be interpreted as 10 - (5 times 20). First, calculate 5 times 20, which equals 100. Then, subtract that from 10: 10 - 100 = -90. Therefore, the answer is -90.
10 times.
-100
10 times
You can subtract 10 from 50 five times. Unless you're feeling rebellious and want to break the rules, then go ahead and subtract 10 as many times as your heart desires. Just don't come crying to me when you're left with a negative number and a bruised ego.
You can subtract 10 from 100 only once in a practical sense, because after that first subtraction, you are no longer subtracting from 100; you're subtracting from 90. However, if you consider the operation itself, you can technically perform the subtraction multiple times until you reach a negative number.
10 times.. because.. 100 * 10 = 1000