21% of 90= 21% * 90= 0.21 * 90= 18.9
90% of 21= 90% * 21= 0.9 * 21= 18.9
111
90 + 21 = 111
-111
90% of 21 = 18.9So, in order to score 90% on a test with 21 questions,you can't miss more than two of them.
The Greatest Common Factor (GCF) of 21 and 90 is 3.
3 3*7=21 3*30=90 * * * * * That is the Greatest Common Factor, GCF, not the LCM. LCM(21, 90) = 630
To determine how many times 21 goes into 90, we need to perform integer division. When we divide 90 by 21, the result is 4 with a remainder of 6. Therefore, 21 goes into 90 four times evenly, with no remainder.
90
630
it is 90%