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  • 1.  Algebra  Library    Chapter 1: Pre-Algebra ConceptsLesson 3.1: Addition and Subtraction Expressions    PracticeSimplify the expression. 1. 1 + (–3) + 8 + (–9) 11. 15 + (–5) – 19 + 12 2. 10 + (–1) + 12 + (–4) 12. 23 + (–8) – 9 + 14 3. 2 + (–5) + 7 + (–21) 13. 16 + (–4) – 18 + 3 4. 13 + (–8) + 9 + (–29) 14. 27 + (–9) – 10 + 8 5. 1 + (–4) + 13 + (–8) 15. 16 + (–8) – 9 + 1 6. 12 – 4 – (–6) – 20 16. 35 – (–7) + 35 – 6 7. 13 – 6 – (–9) – 2 17. 42 – (–8) + 23 – 9 8. –4 – 7 – (–10) – 10 18. 55 – (–9) + 17 – 3 9. 12 – 4 – (–6) – 20 19. 63 – (–15) + 20 – 15 10. 17 – 7 – (–9) – 30 20. 86 – (–34) + 35 – 5Simplify the expression. Perform multiplication and division beforeaddition and subtraction. 21. 5 + 2•5 – 4(–3) + 10 ÷ 2 25. 22 – 12 ÷ 6 + 4(–3) + 9 • 3 22. 6 + 2•8 – 7(–6) + 18 ÷ 3 26. 35 – 15 ÷ 3 + 5(–2) + 4 • 2 23. 12 + 4•9 – 4(–9) + 14 ÷ 2 27. 25 – 14 ÷ 7 + 6(–2) + 3 • 7 24. 19 + 2•6 – 3(–2) + 9 ÷ 3 28. 12 – 44 ÷ 11 + 7(–9) + 8 • 4 1  
  • 2.  Algebra  Library    Chapter 1: Pre-Algebra ConceptsLesson 3.1: Addition and Subtraction Expressions      Answer Key 1. –3 15. 0 2. 17 16. 71 3. –17 17. 64 4. –15 18. 78 5. 2 19. 83 6. –6 20. 150 7. 14 21. 32 8. –11 22. 70 9. –6 23. 91 10. –11 24. 40 11. 3 25. 35 12. 20 26. 28 13. –3 27. 32 14. 16 28. –23 2