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Factor trees are found to find the LCM. 60 = 30 x 2 = 10 x 3 x 2 = 5 x 2 x 3 x 2 (prime numbers, no further breakdown) 80 = 40 x 2 = 20 x 2 x 2 = 5 x 4 x 2 x 2 = 5 x 2 x 2 x 2 x 2 (prime numbers, no further breakdown) Notice that 5 x 2 x 2 appers in the factor tree for 60 and 80. Times all the factor tree numbers together and cross out 5 x 2 x 2: 3 x 5 x 2 x 2 x 2 x 2 = 240 which is the of 60 and 80 QED.

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Multiples of 100- 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000

Multiples of 80- 80, 160, 240, 320, 400, 480, 560, 640, 720, 800

Lowest common multiple is 400

The Least Common Multiple (LCM) for 40 60 is 120.

The LCM is: 240

The LCM is 80.

It is: 1 but the HCF is 20

60.

1200

Q: What is the least common multiple of 40 60 and 80?

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2:2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,[60].. 4: 4,8,12,16,20,24,28,32,36,40,44,48,52,56,[60]... 6: 6,12,18,24,30,36,42,48,54,[60]... 10: 10, 20, 30, 40 ,50, [60]... the least common multiple of these numbers is 60

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