28 Chapter 1 Whole Numbers Section 1.3 Practice Exercises Study Skills Exercise It is very important to attend class every day. Math is cumulative in nature, and you must master the material learned in the previous class to understand today’s lesson. Because this is so important, many instructors tie attendance into the final grade. Write down the attendance policy for your class. Vocabulary and Key Concepts 1. Given the subtraction statement 15 4 11, the number 15 is called the , the number 4 is called the , and the number 11 is called the . Review Exercises For Exercises 2–5, add. 2. 3. 4. 5. 6. Circle the true statement: 7. Circle the true statement: 8. Write the inequality in words: 14 7 21, 14 6 21 0 6 10, 0 7 10 22 6 25 Concept 1: Introduction to Subtraction For Exercises 9–14, identify the minuend, subtrahend, and the difference. 9. 10. 11. 12 8 4 6 1 5 21 12 9 12. 13. 14. For Exercises 15–18, write the subtraction problem as a related addition problem. For example, can be written as 15. 27 9 18 16. 20 8 12 17. 102 75 27 18. 211 45 166 For Exercises 19–24, subtract, then check the answer by using addition. (See Example 1.) 19. Check: 20. Check: 8 3 3 8 7 2 2 7 21. Check: 22. Check: 4 1 1 4 9 1 1 9 23. Check: 24. Check: 6 0 0 6 3 0 0 3 Concept 2: Subtraction of Whole Numbers For Exercises 25–36, subtract and check the answer by using addition. (See Example 2.) 25. 26. 27. 28. 75 50 88 27 54 31 68 23 13 6 19. 19 6 13 17 3 14 9 6 3 32 2 30 46 804 49 782 21 1046 89 45 330 821
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