90, 180, 270, 360, 450, 540, 630 and so on.
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These are the first 90 multiples of 7:714212835424956637077849198105112119126133140147154161168175182189196203210217224231238245152159266273280287294301308315322329336343350357364371378385392399406413420427434441448455462469476483490497504511518525532539546553560567574581588595602609616623630
Multiples of 20 include 20, 40, 60, 80, 100, 120, and so on Multiples of 90 include 90, 180, 270, 360, 450, 540, 630, and so on. Common multiples of 20 and 90 include any multiple of 180.
90 180 270 360
There are infinite common multiples for a set of numbers. So it is not possible to write down all the common multiples. Some common multiples of 15, 30 and 45 are 90, 180, 270, 360,... There is another way to find common multiples: Write the multiples of LCM(15, 30, 45). Actually the common multiples of a set of numbers are the multiples of their LCM. LCM of 15, 30 and 45 is 90. And the multiples of 90 are 90, 180, 270, 360, 450, 540,... which are the common multiples of 15, 30 and 45.
90, 180, 270, 360