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Review for Quiz Know how to use your divisibility rules, especially 2, 3, 4, 5, 9, 10. Review your rule sheet. Example: 310 2: yes (even) 3: no (digits add to 4) 4: no (last 2 digits form 10) 5: yes (last digit is a 0) 9: no (digits add to 4) 10: yes (ends in zero) Be able to list all the factors of a number. Example: 36 1, 2, 3, 4, 6, 9, 12, 18, 36 Know prime and composite definitions. They should be in your spiral. Be able to tell whether a number is prime or composite. Use your sieve for 1-100. Examples 43 is prime because its only factors are 1 and 43 70 is composite because 1, 2, 5, 7, 10, 14, 35, 70 are all factors…it has more than 2 factors Be able to write the prime factorization of a number using a factor tree. 225 5 • 45 5 • 5 • 5 • 9 5 • 3 • 3 3² • 5² Find the Greatest Common Factor either by listing out factors or using prime factorization. Find the GCF of 24 and 36 24: 1, 2, 3, 4, 6, 8, 12, 24 36: 1, 2, 3, 4, 6, 9, 12, 18, 36 GCF = 12 24 3• 8 3• 2• 2• 2 2³ • 3 36 3 • 12 3 •2• 6 3 • 2 •2 •3 2² • 3² GCF= 2 • 2 • 3 = 12 Find equivalent fractions by multiplying or dividing the numerator and the denominator by the same common factor. Simplify a fraction by dividing by the GCF or a common factor until the only common factor is 1. 10 ÷ 5 = 2 35 ÷ 5 = 7 10/35 is equivalent to 2/7 2/7 is the simplified form 3 • 4 = 12 5 • 4 = 20 3/5 is equivalent to 12/20. Solve for the missing variable. 12 = x 21 = 7 x = 4 divide the numerator and denominator by 3