1. 9-2 6th grade math
Estimating Percent

2. Objective
To estimate percents of numbers between 0% and 100% using multiples of 10% or fractions.
Why? To know find quick sales prices and/or discount prices.

3. California State Standards
NS 1.0 : Solve problems involving … percentages. NS 1.4 : Calculate given percentages of quantities …

4. How to Estimate Percent
1) Write the equation, using the % x the amount. Round the numbers to the nearest whole. 2) Convert the % to a decimal and multiply. Round to the nearest cent. 3) Check answer for reasonableness.
9% of $19.99 = 10% x 20 = .1 x 20 = $2 If a sale, $2 off. If tax, add $2.

5. Other Examples 28% of 71 = 30% x 70 = .30 x 70 = 21.00 28% of 71=
28% of 71
82% of 202

6. Try It!
49% of 49
= .5 x 50
= 25.0
2) 11% of 38
=.10 x 40
= 4.00
3) 9% of $59.97
=.10 x $60
=$6.00
4) 22% of 78
= .20 x 80
= 16.00
5) 71% of $17.89
=.70 x $20
=$14.00
6) 20% of 36
=.2 x 40
= 8.0
49% of 49
11% of 38
9% of $59.97
22% of 78
71% of $17.89
20% of 36

7. Objective Review
To estimate percents of numbers between 0% and 100% using multiples of 10% or fractions.
Why? You now know find quick sales prices and/or discount prices.
One way to estimate with percents is to round the percent and the number to the nearest 10. Then multiply the rounded values to find the estimate.

8. Independent Practice Complete problems 8-16
Copy original problem first.
Show all work!
If time, complete Mixed Review: 17-22
If still more time, work on Accelerated Math.