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.
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The multiples of 20 are 20, 40, 60, 80, 100, 120... The multiples of 30 are 30, 60, 90, 120, 150... The multiples of 15 are 15, 30, 45, 60, 75, 90, 105, 120, 135... The common multiples of 20, 30, and 15 are 60, 120, 180, 240...
These are the first 90 multiples of 7:714212835424956637077849198105112119126133140147154161168175182189196203210217224231238245152159266273280287294301308315322329336343350357364371378385392399406413420427434441448455462469476483490497504511518525532539546553560567574581588595602609616623630
10 20 30 40 50 60 70 80 90 100
10, 20, 30, 40, 50, 60, 70, 80 ,90, 100
90 180 270 360