It depends on what you are rounding to. 621 to the nearest 10 would be 620 while 621 to the nearest 100 would be 600.
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2 percent of 621 = 12.422% of 621= 2% * 621= 0.02 * 621= 12.42
if 60% of number = 621 then: number = 621 ÷ 60% = 621/(60/100) = 621×100/60 = 1035
0.477
621 x 53 = 32913
621 is bigger than 37.