58 Chapter 1 Whole Numbers Section 1.6 Practice Exercises Study Skills Exercise In your next math class, take notes by drawing a vertical line about three-fourths of the way across the paper, as shown. On the left side, write down what your instructor puts on the board or overhead. On the right side, make your own comments about important words, procedures, or questions that you have. Vocabulary and Key Concepts 1. a. Given the division statement 15 3 5, the number 15 is called the __________________, the number 3 is called the __________________, and the number 5 is called the __________________. b. 5 5 __________________ c. 5 1 __________________ d. 0 5 __________________ e. 5 0 is __________________ because no number multiplied by 0 equals 5. f. If 17 is divided by 5, the whole part of the quotient is 3 and the __________________ is 2. Review Exercises 2. Rewrite each statement using the indicated property. a. 2 5 _____________; commutative property of addition b. 2 5 _____________; commutative property of multiplication c. 3 (10 2) _____________; associative property of addition d. 3 (10 2) _____________; associative property of multiplication For Exercises 3–10, add, subtract, or multiply as indicated. 3. 48 103 4. 678 83 5. 1008 245 6. 14(220) 7. 8. 789(25) 9. 10. 5230 127 4890 3988 38,002 3902 Concept 1: Introduction to Division For Exercises 11–16, simplify each expression.Then identify the dividend, divisor, and quotient. (See Example 1.) 11. 12. 13. 72 8 32 4 864 14. 15. 16. Concept 2: Properties of Division 17. In your own words, explain the difference between dividing a number by zero and dividing zero by a number. 18. Explain what happens when a number is either divided or multiplied by 1. 20 5 45 9 535
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