521 times 21 = 10941
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21 x 21 = 441
521698/1000 = 521.698 so there are 521 thousands
let X = number X + 1/2 X = 21 1.5 X = 21 X = 14
The GCF of 21 and 84 is 21. Since 21 is a factor of 84, it is automatically the GCF.It is: 21
1 x 21 3 x 7 7 x 3 21 x 1