It is: 210--630 = 840
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420 - 210 = 210 630 - 420 = 210 840 - 630 = 210
3 is not divisible by 630. 630 is divisible by 3.
210
The Least Common Multiple (LCM) of 210 and 315 is 630.
630 just look up LCM calculator on the internet