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Number Theory Addition & Subtraction of Fractions I can… 1. _______ use the divisibility rules to determine if a given number can be evenly divided by 2, 3, 4, 5, 6, 9, or 10. (4-1) 2. _______ identify prime and composite numbers. (4-1) 3. _______ determine the prime factorization of a composite number. (4-2) 4. _______ list all the factors of a given number. (4-2) 5. _______ find the greatest common factor of two or more numbers. (4-3) 6. _______ list the first ten multiples for a given number. (5-5) 7. _______ find the least common multiple of two or more numbers. (5-5) 8. _______ determine the greatest common factor or least common multiple in a problem-solving situation. 9. _______ add fractions by modeling with fraction pieces and by applying the algorithm. (4-8, 5-7, 5-8, and 5-9) 10. _______ subtract fractions by modeling with fraction pieces and by applying the algorithm. (4-8, 5-7, 5-8, and 5-9) 11. _______ use the greatest common factor to write a fraction in simplest form. (4-5) 12. _______ estimate reasonable solutions to fraction addition and subtraction problems. (5-6) 13. _______ find solutions to problem-solving situations involving fractions.