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mth 121 exam 3 review -1 - MTH 121Exam 3 Review Chapter 5&6...

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MTH 121 Exam 3 Review Chapter 5&6 Exam reviews are not comprehensive. Review homework and worksheets. 1. Define Prime number. Define Composite number. 2. Factor 640 into primes using a factor tree. 3. Give 3 equivalent fractions for 4 6 . Shade a rectangular array for each. 4. Find 2 fractions between 7 13 and 9 13 . What property is this? 5. Give a count of the number of factors 3,000 has. DO NOT LIST THEM. 6. Find a number with prime factors 3 and 7, and has 9 factors in all. 7. The next question tests your knowledge of the divisibility rules. Check to see if the number 4,572 is divisible by the following: Divisible by Y/N Reason based on memorized divisibility rules 2 3 4 6 8 9 11
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8. Find the greatest common factor of 24 and 40 using the prime factorization method. 9. Find the GCF (138,102) Show work to indicate that you used the “calculator” (Euclidean) algorithm. 10. Find the least common multiple of 20 and 15. (Any method) 11. Find the LCM of 2 3 x 3 4 and 3 2 x 7 2 .
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