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

Answer 1

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.

Answer 2

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

Answer 3

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

Answer 4

The LCM is: 240

Answer 5

The LCM is 80.

Answer 6

It is: 1 but the HCF is 20

Answer 7

60.

Answer 8

1200