Using Number Sense to Solve One-Step Equations

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Presentation transcript:

Using Number Sense to Solve One-Step Equations LESSON 3-4 Additional Examples Is the equation 24 – 16 = 8 true or false? 24 – 16 8 Write the equation. 8 Subtract 16 from 24. 8 = 8 Compare. The equation is true.

Using Number Sense to Solve One-Step Equations LESSON 3-4 Additional Examples Use mental math to solve each equation. a. y – 7 = 15 What you think 22 – 7 = 15, so the solution is 22. b. d ÷ 9 = 6 What you think 54 ÷ 9 = 6, so the solution is 54.

Using Number Sense to Solve One-Step Equations LESSON 3-4 Additional Examples Use the strategy Guess, Check, and Revise to solve r + 27 = 89. Estimate Round the numbers. r + 27 = 89 r + 30 = 90 What you think You know 60 + 30 = 90, so r is close to 60. Try r = 60. 60 + 27 = 87 Too low. Try r = 61. 61 + 27 = 88 Too low. Try r = 62. 62 + 27 = 89 Right. The solution to r + 27 = 89 is r = 62.