1 / 8

Calculations with Percents

45%. 8 %. 12%. Calculations with Percents. 36%. 90%. 1 0%. .7%. 64%. 85%. 57%. Review:. Change a fraction to a decimal: Divide the numerator by the denominator. Example: Change 5 / 9 to a decimal. 5 ÷ 9 means 9 5.000 5 / 9 = 0.55 or 0.56. 0.5. 5. 5.

aran
Download Presentation

Calculations with Percents

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 45% 8% 12% Calculations with Percents 36% 90% 10% .7% 64% 85% 57%

  2. Review: • Change a fraction to a decimal: • Divide the numerator by the denominator. • Example: Change 5/9 to a decimal. • 5 ÷ 9 means 9 5.000 • 5/9= 0.55 or 0.56 0.5 5 5 -45 0 5 -45 5 0

  3. Review: • Change a decimal/number to a percent: • Move the decimal two places to the right. (Multiply by 100). • Example: Change 0.683 to a percent. • 0.683(100) = 68.3% • Change a percent to a decimal/number: • Move the decimal two places to the left. (Divide by 100). • Example: Change 3% to a decimal. • 3 ÷ 100 = 0.03

  4. You cannot do any math problems with percents. You must change the percent to a decimal.

  5. Finding a Percent of a Number • What is 25% of 32? • Step 1: Change English to Math. • What is your variable • IS is your = sign • Change your percent to a decimal • OF means multiply • x = .25(32) • Step 2: Decide how to solve the problem, then solve. • x = 8 • 8 is 25% of 32.

  6. Finding the Percent One Number is of Another • What percent of 120 is 90? • Step 1: Change English to math. • What is your variable • OFmeans multiply • ISis your =sign • x(120)=90 • Step 2: Decide how to solve the problem, then solve. • x = 90÷120 = 0.75 • Step 3: Change your answer to a percent. • x = 75% 75% of 120 is 90.

  7. Finding a Number when the Percent is Known • 36 is 4% of what number? • Step 1: Change English to Math. • ISis your = sign • Change your percent to a decimal • OF means multiply • Whatis your variable • 36 = 0.04(x) • Step 2: Decide how to solve the problem, then solve. • 36÷ 0.04 = x • x = 900 • 36 is 4% of 900

  8. Practice: • What number is 44% of 6? • 125 is what percent of 1250? • 32 is 25% of what number? 2.64 10% 128

More Related