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8-1 Percent and Estimation

8-1 Percent and Estimation. Pages 334-337 Indicator(s)  N8 Develop and analyze algorithms for computing with percents and demonstrate fluency in use. To estimate the percent of a number…. …you can use a fraction or a multiple of 10% or 1%. Example 1 Use a fraction to estimate 77% of 800.

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8-1 Percent and Estimation

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  1. 8-1 Percent and Estimation Pages 334-337 Indicator(s) N8 Develop and analyze algorithms for computing with percents and demonstrate fluency in use.

  2. To estimate the percent of a number… …you can use a fraction or a multiple of 10% or 1%. Example 1 Use a fraction to estimate 77% of 800. 77% is about 75% or . 77% of 800 ≈ × 800 ≈ 600 So, 77% of 800 is about 600.

  3. Percents greater than 100 Example 2 Percents greater than 100. Estimate 137% of 50. 137% is more than 100%, so 137% is going to be greater than 50. 137% is about 140%. 140% of 50 = (100% × 50) + (40% × 50) = (1 × 50) + ( × 50) = 50 + 20 = 70 So, 137% of 50 is about 70.

  4. Percents less than 1 Example 3 Percents less than 1. Estimate 0.5% of 692. 0.5% is half of 1%. 692 is about 700 To find 1% of 700, change % to decimal and multiply. 1%= 0.01 SO… = 0.01 × 700 = 7 One half of 7 is 7 × or 3.5 So, 0.5% of 692 is about 3.5.

  5. Estimate by using 10% Example 4 Estimate 59% of 500. 10% of 500 is 50. 59% is about 60%. 60% of 500 is 6 × 10%. 6 × 50 = 300 So, 59% of 500 is about 300.

  6. 8-1 b • Page 338-339 • #1-13 all

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