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Course 1. Subtraction Equations. 2-6. Warm Up. Problem of the Day. Lesson Presentation. Course 1. Warm Up Solve each equation . 1. x + 7 = 22 2. 18 + x = 105 3. 16 = x + 9 4. 23 = x + 4. x = 15. x = 87. x = 7. x = 19. Problem of the Day

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Course 1

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  1. Course 1 Subtraction Equations 2-6 Warm Up Problem of the Day Lesson Presentation Course 1

  2. Warm Up Solve each equation. 1.x + 7 = 22 2. 18 + x = 105 3. 16 = x + 9 4. 23 = x + 4 x = 15 x = 87 x = 7 x = 19

  3. Problem of the Day Bruce has 25 CDs remaining after giving 14 to John, 17 to Mary, and 25 to Sue. How many CDs did he begin with? 81

  4. Learn to solve whole-number subtraction equations.

  5. When John F. Kennedy became president of the United States, he was 43 years old, which was 8 years younger than Abraham Lincoln was when Lincoln became President. How old was Lincoln when he became president?

  6. 8 + 8 + 8 Let a represent Abraham Lincoln’s age. Abraham Lincoln’s age John F. Kennedy’s age – = – = a 8 43 a – 8 = 43 a = 51 Abraham Lincoln was 51 years old when he became president.

  7. y – 23 = 39 23 is subtracted fromy. + 23 + 23 ? 62 – 23 = 39 ? 39 = 39 Additional Example 1A: Solving Subtraction Equations Solve y – 23 = 39. Check your answer. Add 23 to both sides to undo the subtraction. y = 62 Check y – 23 = 39 Substitute 62 fory in the equation. 62 is the solution. 

  8. 78 = s – 15 15 is subtracted froms. + 15 + 15 ? 78 =93 – 15 ? 78 = 78 Additional Example 1B: Solving Subtraction Equations Solve 78 = s – 15. Check your answer. Add 15 to both sides to undo the subtraction. 93 = s Check 78=s – 15 Substitute 93 fors in the equation. 93 is the solution. 

  9. z – 3 = 12 3 is subtracted fromz. + 3 + 3 ? 15 – 3 = 12 ? 12 = 12 Additional Example 1C: Solving Subtraction Equations Solve z – 3 = 12. Check your answer. Add 3 to both sides to undo the subtraction. z = 15 Check z – 3 = 12 Substitute 15 forz in the equation.  15 is the solution.

  10. a – 4 = 7 4 is subtracted froma. + 4 + 4 ? 11 – 4 = 7 ? 7 = 7 Check It Out: Example 1A Solve a – 4 = 7. Check your answer. Add 4 to both sides to undo the subtraction. a = 11 Check a – 4 = 7 Substitute 11 fora in the equation.  11 is the solution.

  11. 57 = c – 13 13 is subtracted fromc. + 13 + 13 ? 57 =70 – 13 ? 57 = 57 Check It Out: Example 1B Solve 57 = c – 13. Check your answer. Add 13 to both sides to undo the subtraction. 70 = c Check 57=c – 13 Substitute 70 forc in the equation. 70 is the solution. 

  12. g – 62 = 14 62 is subtracted fromg. + 62 + 62 ? 76 – 62 = 14 ? 14 = 14 Check It Out: Example 1C Solve g – 62 = 14. Check your answer. Add 62 to both sides to undo the subtraction. g = 76 Check g – 62 = 14 Substitute 76 forg in the equation.  76 is the solution.

  13. Lesson Quiz x = 30 1.x – 9 = 21 2. 14 = x – 3 3.x – 7 = 11 4. 16 = x – 14 5.x – 9 = 11 x = 17 x = 18 x = 30 x = 20 6. Susan is taller than James. The difference in their height is 4 inches. James is 62 inches tall. How tall is Susan? 66 inches

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