210

The least common multiple of 3 and 8 is 24.

Least common multiple (LCM) of 3 and 5 is 15.

15 and 30 are common multiples of 3 and 5. Any two numbers have an infinite amount of common multiples.

The LCM of 3,5,7 3 , 5 , 7 is the result of multiplying all prime factors the greatest number of times they occur in either number. The LCM of 3,5,7 3 , 5 , 7 is 3⋅5⋅7=105 3 ⋅ 5 ⋅ 7 = 105 .

The first 5 multiples of 7 are 7, 14, 21, 28, and 35.

The first six multiples of 7 are 7, 14, 21, 28, 35, and 42. The first ten multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, and 80. The first six multiples of 15 are 15, 30, 45, 60, 75, and 90.

35

Multiples of 5 : 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,… Multiples of 7 : 7,14,21,28,35,42,49,56,63,70,77,… Multiples of 10 : 10,20,30,40,50,60,70,80,…

In common notation: lcm (7,5) = 35. The LCM of 5, 7 and 15 is: LCM means the lowest common multiple of two or more given numbers. It can be obtained by multiplying all the given numbers among themselves and dividing it by the common factors of given numbers.

30

105

1

The biggest common factor number is the GCF number. So the greatest common factor 7 and 15 is 1.

The biggest common factor number is the GCF number. So the Greatest Common Factor 7, 15, 21 is 1.

7 = 7. To find the GCF, multiply all the prime factors common to both numbers: Therefore, GCF = 7.

Greatest common factor (GCF) of 7 and 13 is 1.

The common factors of 7 and 28 are 7, 1, intersecting the two sets above. In the intersection factors of 7 ∩ factors of 28 the greatest element is 7. Therefore, the greatest common factor of 7 and 28 is 7.