1. Pre-Algebra Rounding and Estimating Lesson 3-1 a. Round 8.7398 to the nearest tenth. 8.7398 tenths place less than 5 8.7 Round down to 7. Additional Examples

2. Pre-Algebra (continued) Rounding and Estimating Lesson 3-1 b. Round 8.7398 to the nearest integer. 8.7398 nearest integer is ones place 5 or greater 9 Round up to 9. Additional Examples

3. Pre-Algebra Estimate to find whether each answer is reasonable. Rounding and Estimating Lesson 3-1 a. Calculation +$ 59.98 $ 83.21 $115.67 $258.86 +$ 60 $ 80 $120 Estimate $260 The answer is close to the estimate. It is reasonable. Additional Examples

4. Pre-Algebra (continued) Rounding and Estimating Lesson 3-1 b. Calculation –$ 39.34 $176.48 $137.14 Estimate –$ 40 $180 $140 The answer is not close to the estimate. It is not reasonable. Additional Examples

5. Pre-Algebra Add the front-end digits. You are buying some fruit. The bananas cost $1.32, the apples cost $2.19, and the avocados cost $1.63. Use front-end estimation to estimate the total cost of the fruit. Rounding and Estimating Lesson 3-1 5.10= The total cost is about $5.10. + Estimate by rounding..60.20.30 1.10 Additional Examples

6. Pre-Algebra Estimate the total electricity charge: March: $81.75; April: $79.56; May: $80.89. Rounding and Estimating Lesson 3-1 240= The total electricity charge is about $240.00. The values cluster around $80. 80 3 months 3 Additional Examples