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Factors, Common Factors, and Greatest Common Factor (GCF) Factors are numbers that are multiplied to get a product (the math facts) 8 X 7 = 56 What does “Find the factors” mean? …find all the numbers you can multiply together to get that number as the product. These rules will help you find all of the factors of any given number!! EVERY number greater than 1 has the number 1 and itself as a factor. When the factor is the same, you only list it once (ex. 6 x 6 = 36) Find the factors using a factor rainbow: 1. 18 2. 24 3. 52 Write this example in your journal Find the factors using a factor t-chart: 1. 12 2. 30 3. 66 Factors, Common Factors, and Greatest Common Factor (GCF) What does COMMON mean? What does FACTORS mean? So….. COMMON FACTORS are: Factors that two or more numbers have in common… or the same multiplication facts in two or more numbers 24 16 1 2 4 16 8 4 1 2 3 4 24 12 8 6 Remember: Once you repeat a number you’re done!! 16: 1, 2, 4, 8, 16 24: 1, 2, 3, 4, 6, 8, 12, 24 Common Factors: 1, 2, 4, 8 What are the common factors of: 1. 6 & 9 Use either a Factor 2. 24 & 48 Rainbow or Factor T-Chart to find the 3. 25 & 45 factors for each number. The greatest factor that both numbers have in common. GCF = Greatest Common Factor 9 1x9 3x3 12 1 x 12 2x6 3x4 9 : 1,3,9 12: 1,2,3,4,6,12 Find the GCF: 1. 2. 12 & 26 9 & 21