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21 can be divided by 7 but 18 cant
18/21 = 6/7
21
The LCM of 21 and 18 is 126.
The highest common factor of 21 and 18 is 3
The Least Common Multiple of 18 and 21 is 126.
-21
-18
18, yes.21, no.
18/21
18
18 is what percent of 21= 18 / 21= 0.857143Converting decimal to a percentage:0.857143 * 100 = 85.71%
19
LCD(18, 21) = 126
-39
21/18 = 7/6 ~ 1.1666...7