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Course 2 Chapter 1 Section 1

Course 2 Chapter 1 Section 1. Using Estimation Strategies. Reviewing Skills You Need:. Round the Place to the underlined Digit. Estimate. 3,528. 3,500. 100:. Estimate. 24,106. 24,110. 10:. Estimate. 54. 50. 10:. Estimate. 131,295. 10,000:. 130,000. Estimate. 82,729.

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Course 2 Chapter 1 Section 1

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  1. Course 2 Chapter 1 Section 1 Using Estimation Strategies

  2. Reviewing Skills You Need: Round the Place to the underlined Digit

  3. Estimate 3,528 3,500 100:

  4. Estimate 24,106 24,110 10:

  5. Estimate 54 50 10:

  6. Estimate 131,295 10,000: 130,000

  7. Estimate 82,729 1,000: 83,000

  8. Objective 1: Estimating by Rounding Example 1: Estimating a Sum or Difference At the zoo, you see a Columbian black spider monkey. The length of its body is 58.31 cm. The length of its tail is 78.96 cm. To the nearest tenth of a centimeter, estimate the total length of the monkey’s body and tail.

  9. 58.31 cm + 78.96 cm ≈ 58.3 cm + 79.0 cm Round to the nearest tenth 137.3 cm Add

  10. Objective 1: Estimating by Rounding Example 2: Estimating a Product A rectangular kitchen is 8.5 ft. long and 5.75 ft. wide. Use rounding to estimate the area of the kitchen in square feet.

  11. 8.5 ft. × 5.75 ft ≈ 9 ft. × 6 ft. Round to the nearest whole foot 54 square feet Multiply

  12. Objective 2: Estimating by Front-End Estimation and Compatible Numbers

  13. Example 3: Estimating with Front-End Estimation At a snack shop, you order a taco that costs $3.79, a juice that costs $.89, and a yogurt that costs $1.39. Estimate the total cost of your order.

  14. Step 1: Add the front end digits $3.79 $0.89 $1.39 + $4

  15. Step 2: Estimate the total amount of cents to the nearest dollar. $3.79 $0.89 $1.39 About $2 +

  16. Step 3: Add the dollars and Estimated cents + $4 $2 = $6 Total cost is about $6

  17. Compatible Numbers: (Friendly Numbers) Compatible Numbers are numbers that are easy to compute mentally. Compatible Numbers are particularly useful to solve quotients.

  18. Example 4: Estimating Using Compatible Numbers Suppose you have saved $61.80. About how many CD’s can you buy if each costs $15.95?

  19. $61.80 ÷ $15.95 ≈ $60 ÷ $15 ≈ 4 About 4 CD’s

  20. Questions?

  21. Assignment: Practice 1-1 Worksheet

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