4 8 12 16 20 24 28 32 36 40
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5, 10, 15, 20
To find the lowest common multiple, list the multiples of each of the numbers and find the first they have in common.10=10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,18018=18,36,54,72,90,108,126,144,162,1804=4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100, 104,108,112,116,120,124,128,132,136,140,144,148,152,156,160,164,168,172, 176,180So the LCM is 180.
the multiples of 4 are 4,8,12,16,20,24,28,32,36,40,44,48,52,56,60 those are the multiples of 4
5 + 10+15+20=50 ans
3, 6, 9 4, 8, 12 5, 10, 15 Common multiples include 60, 120, and 180.