Factors and Multiples - Math Online Tutoring

Factors and Multiples - Math Online Tutoring What are factors? Numbers that can be multiplied to make another number is called factor. Example: Factors for number 6 are 6, 1 and 2, 3 What are multiples? Number that can be made by multiplying by a certain number is called multiples. Example: Multiples of 6 are 6, 12, 18, 24. GCF: Greatest Common Factor How to find GCF? a) List the prime factors of each number b) Multiply the common factors of both the numbers. Example: GCF of 18 and 24 Prime factors of 18 = 2x 3x3 Prime factors of 24 = 2x2 x2 x 3 There is one 2 and one 3 in common The GCF is 2 x 3 = 6 1) Find LCM of 2 and 5 Answer: Multiplies of 2 are 2,4,6,8,10,12,142 Multiples of 5 are 5,10,15,20,25,30 Least common multiple is 10. NOTE:When LCM and product of numbers is given to find the GCF then the formulaused is LCM x GCF = product of two numbers If x y then LCM (x, y) is x. If x y then GCF (x, y) is y.