Chapter 6, Section 5: Proportions and Percents

Reminder: a percentage is the number over 100 (as the denominator).

Warm Up: Write each percentage as a fraction.

1) 24%

2) 75.5%

3) 132%

1) 24/100

2) 75.5/100

3) 132/100

Finding Part of a Whole

IS over OFIS and Number → NumeratorOF and Number → Denominator

Find 65% of 245 1) turn the percentage into a fraction

2) make a proportion

3) cross product

65

100=

245

x

(65)(245) = (x)(100) → 15,925 = (x)(100) → x = 159.25

IS over OFIS and Number → NumeratorOF and Number → Denominator

25% of 124 is?

25/100

25100

= x124

Now use cross product to

determine what 25% of 124 is.

(25)(124) = (x)(100) → 3100 = (x)(100) → 31 = x

IS over OFIS and Number → NumeratorOF and Number → Denominator

Find the missing Part.

1) 43% of 230 is?

2) 12.5% of 80 is?

3) 132% of 45 is?

1) x = 98.9

2) x = 10

3) x = 59.4

IS over OFIS and Number → NumeratorOF and Number → Denominator

Finding a Percent: Remember, percentage is the number, over 100.

What percent (%) of 60 is 52?

Of 60 is the denominator

Is 52 is the numerator ? 100

= 52 60

IS over OFIS and Number → NumeratorOF and Number → Denominator

1) What Percentage of 250 is 138?

2) 14 is what percentage of 15?

Have Ms. D-H Check!

IS over OFIS and Number → NumeratorOF and Number → Denominator

Finding Whole Amounts: Remember, percentage is the number, over 100.

1) 207 is 46% of what number?

2) 19 is 75% of what number?

3) 310 is 99% of what number?

1) whole = 450

2) whole = 25.333

3) Whole = 313.1313

Using Percents to Solve a Problem

Assignment #22Practice 6-5

www.phschool.comCode: awe-0605