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Write factor pairs for each number. Use divisibility tests to help you! 407257 1 x 40 2 x 20 4 x 10 5 x 8 1 x 72 2 x 36 3 x 24 4 x 18 6 x 12 1 x 57 3 x.

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Presentation on theme: "Write factor pairs for each number. Use divisibility tests to help you! 407257 1 x 40 2 x 20 4 x 10 5 x 8 1 x 72 2 x 36 3 x 24 4 x 18 6 x 12 1 x 57 3 x."— Presentation transcript:

1 Write factor pairs for each number. Use divisibility tests to help you! 407257 1 x 40 2 x 20 4 x 10 5 x 8 1 x 72 2 x 36 3 x 24 4 x 18 6 x 12 1 x 57 3 x 19 8 x 9

2 Write factor pairs for each number. Use divisibility tests to help you! 1220 1 x 12 2 x 6 3 x 4 1 x 20 2 x 10 4 x 5 1 x 37 37 PRIME

3 PRIME NUMBERS A whole number with exactly 2 factors, 1 and itself 12345678910 111213 14151617181920

4 Make a prime factor tree for each number. 24 60 46x 2x22x3x 6x10 2x32x5x 24 = 2 x 2 x 2 x 3 24 = 2 3 x 3 60 = 2 x 2 x 3 x 5 60 = 2 2 x 3 x 5

5 You can use prime factorizations to find the GCF or to simplify fractions. 24 60 46x 2x22x3x 6x10 2x32x5x 24 60 2 x 2 x 2 x 3 2 x 2 x 3 x 5 2 5 GCF 2 x 2 x 3 = 12

6 Make a prime factor tree for each number to find the GCF. 36 54 66x 2x32x3x 6x9 2x33x3x 36 = 2 x 2 x 3 x 3 54 = 2 x 3 x 3 x 3 GCF 2 x 3 x 3 = 18

7 Make prime factor trees for each number. Use the prime factorizations to find the GCF and to simplify the fraction. 40 56 410x 2x22x5x 2x28 2x2 4x7 40 56 2 x 2 x 2 x 5 2 x 2 x 2 x 7 5 7 GCF 2 x 2 x 2 = 8 ==

8 List the factors of 15. 15 1 x 15 3 x 5 List the multiples of 15. 15, 30, 45, 60, 75, …

9 List the first 5 multiples of each number. 12 12, 24, 36, 48, 60 16, 32, 48, 64, 80 16 24 24, 48, 72, 96, 120

10 Use the LCM to get a common denominator. 12 12, 24, 36, 48, 60 16, 32, 48, 64, 80 16 24 24, 48, 72, 96, 120 7 12 5 16 48 = = 28 15

11 Use the LCM to get a common denominator. 12 12, 24, 36, 48, 60 16, 32, 48, 64, 80 16 24 24, 48, 72, 96, 120 9 24 5 16 48 = = 18 15

12 Use the LCM to get a common denominator. 12 12, 24, 36, 48, 60 16, 32, 48, 64, 80 16 24 24, 48, 72, 96, 120 5 12 11 24 24 = = 10 11

13 List the factors of 32. 32 1 x 32 2 x 16 4 x 8

14 Make a prime factor tree for 32. 32 48x 2x22x4 2x16 2x2 4x4 32 = 2 x 2 x 2 x 2 x 2 32 = 2 5 2x22x2x

15 Use the prime factorization to simplify 12 32 26x 2x3 2x16 2x2 4x4 12 = 2 x 2 x 3 2x2x 12 32 32 = 2 x 2 x 2 x 2 x 2 3838 What is the GCF? 4

16 List factor pairs to find the GCF. 1830 1 x 18 2 x 9 3 x 6 1 x 30 2 x 15 3 x 10 5 x 6 Use the GCF to simplify: 18 30 ÷ 6 GCF = 6 3 10

17 Write the expressions using exponents. 2 x 3 x 3 x 5 x 5 = 5 x 5 x 5 x 7 x 7 = 2 x 3 2 x 5 2 5 3 x 7 2

18 Find the LCM. 8 8, 16, 24, 32, 40 10, 20, 30, 40 10 3838 4 10 40 = = 15 16


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