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N.S. 1.3: Converting Fractions, Decimals, & Percents Period Odds: 9/19/13 Period Evens: 9/20/13.

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Presentation on theme: "N.S. 1.3: Converting Fractions, Decimals, & Percents Period Odds: 9/19/13 Period Evens: 9/20/13."— Presentation transcript:

1 N.S. 1.3: Converting Fractions, Decimals, & Percents Period Odds: 9/19/13 Period Evens: 9/20/13

2 Fractions to Decimals: To change a fraction into a decimal, we must divide the fraction. Example 1: What decimal is the same as 3/8? Big Note: “Top dog gets the house”

3 Example 2: What decimal is the same as 3/11?

4 Whiteboard CFU What decimal is equal to 2/7?

5 Answer:.29

6 Whiteboard CFU What decimal is equal to 5/7?

7 Answer: 0.71

8 Fractions to Percents: We can convert fractions into percents using two methods. Select the method that is most comfortable for you! But you need to be familiar with both!

9 Fractions to Percents: Method 1 Convert fraction to a decimal MULTIPLY that decimal by 100, which means you MOVE the decimal over two spaces.

10 Example: 3 = Decimal to Percent= 37.5 %

11 Fractions to Percents: Method 2 Begin with the fraction… Example: 4/5= Step 1: Set the fraction equal to “x over 100” 4/5= x/100

12 Step 2: Cross-multiply the proportion, then solve for x. Whatever x equals will be your percent 4(100)= 5(x) 400= 5x 400/5= 5x/5 80=x Answer: 4/5= 80%

13 Percents to Decimals and Fractions: Example: Convert 45% into a fraction and a decimal. Simplify fraction. PercentFractionDecimal

14 Whiteboard CFU 1. Change 8/15 into a percent

15 Answer: 53.33%

16 Whiteboard CFU Change 17/50 into a percent (use different method then the one used before)

17 Answer: 34%

18 Whiteboard CFU Convert 36% into a FRACTION and DECIMAL

19 Whiteboard CFU Convert 325% into a FRACTION and DECIMAL

20 NS 1.3 Homework Practice (Round to the nearest hundredths) Change each fraction to a decimal 1. 5/ 10= 2. 3/11= 3. 24/25= 4. 4/7= 5. 2/3= Change each fraction to a percent using “method 1”: 6. 4/5= 7. 6/12= 8. 3/7= 9. 2/9= 10. 5/7= Change each fraction to a percent using “method /5= 12.20/25= 13. 7/13= 14.6/ /15=


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