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Objective

Estimate percents by using fractions and decimals

Vocabulary

None

Example 1 Use Fractions to Estimate

Example 2 Use Fractions to Estimate

Example 3 Estimate by Using 10%

Example 4Percents Greater Than 100 or Less Than 1

Example 5Percents Greater Than 100 or Less Than 1

Example 6 Estimate Percent to Solve a Problem

Estimate 61% of 407

Write the problem

60%

6 4

240Answer:

1/6

61% of 407

Remember: When directions say to “estimate” the exact answer will be wrong

Round 61% to an easy number

“of” refers to multiplication

Round 407 to an easy number

400

Multiply non-zero numbers24

Bring down zeros

000

Remove % sign by dividing by 100 (move decimal 2 places to the left)

.

Estimate 28% of 92.

Answer: 27

1/6

Estimate 18% of 296

60

20%

2 3

Answer:

2/6

Write the problem

18% of 296

Remember: When directions say to “estimate” the exact answer will be wrong

Round 18% to an easy number

“of” refers to multiplication

Round 296 to an easy number

300

Multiply non-zero numbers6

Bring down zeros

000

Remove % sign by dividing by 100 (move decimal 2 places to the left)

.

Estimate 71% of 198.

Answer: 140

2/6

Estimate 59% of 500

60%

6 5

300Answer:

3/6

Write the problem

59% of 500

Remember: When directions say to “estimate” the exact answer will be wrong

Round 59% to an easy number

“of” refers to multiplication

500 is already an easy number

500

Multiply non-zero numbers30

Bring down zeros

000

Remove % sign by dividing by 100 (move decimal 2 places to the left)

.

Estimate 39% of 700

Answer: 280

3/6

Estimate 173% of 60

170%

17 6

102Answer:

4/6

Write the problem

173% of 60

Remember: When directions say to “estimate” the exact answer will be wrong

Round 173% to an easy number

“of” refers to multiplication

60 is already an easy number

60

Multiply non-zero numbers102

Bring down zeros

00

Remove % sign by dividing by 100 (move decimal 2 places to the left)

.

Estimate 142% of 80.

Answer: 112

4/6

9

5/6

Write the problem

of 898

Remember: When directions say to “estimate” the exact answer will be wrong

Keep as is

“of” refers to multiplication

Round 898 to number compatible with 3 the denominator

900

Multiply non-zero numbers3

Bring down zeros

00

9

5/6

of 898

900

300

Remove % sign by dividing by 100 (move decimal 2 places to the left)

.

Answer: 3

Answer: 2

5/6

GAME ATTENDANCE Last season 96,081 people were in attendance at a college football game. About 0.25% of those were reporters from newspapers and television and radio stations. About how many media people were present?

6/6

Write the problem0.25% of 96,081

Round 0.25% to an easy number0.3%

“of” refers to multiplication

Round 96,081 to an easy number

96,000

GAME ATTENDANCE Last season 96,081 people were in attendance at a college football game. About 0.25% of those were reporters from newspapers and television and radio stations. About how many media people were present?

6/6

0.25% of 96,081

0.3% 96,000

Multiply non-zero numbers

3 96

288

Bring down zeros

000

Remove % sign by dividing by 100 (move decimal 2 places to the left)

Remove decimal in 0.3 by moving the decimal 1 more place to left

.

288 Add dimensional analysispeopleAnswer:

Answer: 35

CONCERT The attendance at a popular outdoor concert was recorded as 6,973. Of those attending, 0.5% were security personnel. About how many security people were present?

*

6/6

Assignment

Lesson 8:1 Percent and Estimation 15 - 32 All