20
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90, 180, 270, 360, 450
10
The GCF of 30 and 20 is 10. The GCF of 40 and 20 is 20.
The LCM of 8, 10, and 20 is 40. Multiples of 8: 8, 16, 24, 32, 40, 48...... Multiples of 10: 10, 20, 30, 40, 50, 60...... Multiples of 20: 20, 40, 60, 80 The smallest number that all three numbers go into evenly is 40. Therefore the LCM of 8, 10, and 20 is 40.
5: 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,110.10: 10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180,190.