To determine the least common multiple of two numbers, determine the prime factors of both numbers. Then, determine the prime factors they have in common. Multiply all their prime factors together (in other words, multiply both numbers together) and divide by the prime factors they have in common (in other words, their greatest common factor).
The prime factors of 60 are 2, 2, 3, and 5.
The prime factors of 90 are 2, 3, 3, and 5.
The prime factors in common are 2, 3, and 5, so the greatest common factor is 2 x 3 x 5 = 30. The least common multiple is thus (2 x 2 x 3 x 5) x (2 x 3 x 3 x 5) ÷ (2 x 3 x 5) or 60 x 90 ÷ 30 = 180.
A similar way to use the prime factors is to take the prime factors of one number and cross out any that appear in the other number, then multiply the remaining ones together to calculate the least common multiple.
60 has 2, 2, 3, and 5
90 are 2, 3, 3, and 5
The least common multiple of 60 and 90 is 2 x 2 x 3 x 5 x 3 = 180.
180
60 and 90, among others.
The least common multiple of the numbers 210 and 90 is 630.
The least common multiple of 96 , 90 = 1,440
The least common multiple of 54 , 63 = 378
The Least Common Multiple of 90, 60 is 180.
The least common multiple of 30 , 75 , 60 , 90 = 900
The least common multiple of 50, 60 and 90 is 900.
180
The Least Common Multiple (LCM) for 48 60 90 is 720.
The LCM is: 720
The LCM is: 360
60 and 90, among others.
3. ^WRONG !... the lowest common multiple of 15 & 18 is 60 ! I thought it was 90.
The Least Common Multiple of 18 and 90 is 90.
The least common multiple of the numbers 210 and 90 is 630.
The least common multiple of 7 , 90 = 630