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Percent and Estimation

Percent and Estimation. 1 3. 2 3. 33 %. 66 %. 1 10. The table shows common percents and their fraction equivalents. You can use fractions to estimate the percent of a number by choosing a fraction that is close to a given percent. 20%. 10%. 25%. 50%. 75 %. 1 4. 3 4. 1 5.

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Percent and Estimation

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  1. Percent and Estimation

  2. 1 3 2 3 33 % 66 % 1 10 The table shows common percents and their fraction equivalents. You can use fractions to estimate the percent of a number by choosing a fraction that is close to a given percent. 20% 10% 25% 50% 75% 1 4 3 4 1 5 1 3 2 3 1 2 Divide by 10 Divide by 4 Divide by 3 Divide by 2 Divide by 5 Divide by 3, multiply by 2 Divide by 4, multiply by 3

  3. Remember:”Of” means to multiply EX 1) Use a fraction to estimate 27% of 63. 27% X63  Round 27% to a percent that is easy to change to a fraction like 25% . 1 4 X 63 25% X63  1 4 Change 63 to a number that will be easily simplified by the fraction. X64  16 Multiply. 27% of 63 is about 16.

  4. Estimate percents by figuring 10%. Use mental math. EX 2) Estimate 38% of 91. Round 38% to 40% and 91 to 90. 40% of 90 Find 10% of 90 = 9 Since there are 4 – 10% in 40%, multiply by 4 9 X 4 = 36 38% X91 ≈ 36. 38% of 91 is about 36. EX 3) Estimate ½ % of 240. EX 4) Estimate 5% of 70. 10% of 240 = 24 10% of 70 = 7 1% of 240 = 2.4 5% of 70 = 3.5 ½ % of 240 = 1.2

  5. Assignment Page 231 Problems 2-10 evens

  6. Notes start here

  7. Percent and Estimation Date _______________

  8. The table shows common percents and their fraction equivalents. You can use fractions to estimate the percent of a number by choosing a fraction that is close to a given percent.

  9. Remember:”Of” means to multiply EX 1) Use a fraction to estimate Round 27% to a percent that is easy to change to a fraction like ____ . Change 63 to a number that will be easily simplified by the fraction. Multiply.

  10. Estimate percents by figuring 10%. Use mental math. EX 2) Round 38% to ____ and 91 to ____ Since there are 4 – 10% in 40%, multiply by __ EX 3) EX 4)

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