Percent and Estimation

The table shows common percents and their fraction equivalents 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. Percent Fraction 20% 33 % 1 3 66 % 2 3 10% 25% 50% 75% 1 10 1 5 1 4 1 3 1 2 2 3 3 4 Divide by 10 Divide by 5 Divide by 4 Divide by 3 Divide by 2 Divide by 3, multiply by 2 Divide by 4, multiply by 3

Remember:”Of” means to multiply EX 1) Use a fraction to estimate 27% of 63. 27% X 63  Round 27% to a percent that is easy to change to a fraction like 25% . 1 4 25% X 63  X 63 1 4 X 64 Change 63 to a number that will be easily simplified by the fraction.   16 Multiply. 27% of 63 is about 16.

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% X 91 ≈ 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

Assignment Page 231 Problems 2-10 evens

Notes start here

Percent and Estimation Date _______________ Percent and Estimation

The table shows common percents and their fraction equivalents 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. Percent Fraction

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.

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)