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Copyright©amberpasillas2010 MULTIPLYING FRACTIONS.

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Presentation on theme: "Copyright©amberpasillas2010 MULTIPLYING FRACTIONS."— Presentation transcript:

1 copyright©amberpasillas2010 MULTIPLYING FRACTIONS

2 copyright©amberpasillas2010 If I have one-half of a one-fourth piece, how much will I have compared to a whole square?

3 copyright©amberpasillas2010 Multiply ½ times ¼ x = ½ ¼

4 copyright©amberpasillas2010 Multiply ½ times ¼ x = ½ ¼

5 copyright©amberpasillas2010 Multiply ½ times ¼ x = ½ ¼ 1/8

6 copyright©amberpasillas2010 If I have three-fifths of a three-fourths piece, how much will I have compared to a whole square?

7 copyright©amberpasillas2010 Multiply 3/5 times 3/4 x = 3/5 3/4

8 copyright©amberpasillas2010 Multiply 3/5 times 3/4 x = 3/5 3/4

9 copyright©amberpasillas2010 Multiply 3/5 times 3/4 x = 3/5 3/4 = 9/20

10 copyright©amberpasillas2010 If I have one-half of a two thirds piece, how much will I have compared to a whole square?

11 copyright©amberpasillas2010 Multiply ½ times 2/3 x = ½ 2/3

12 copyright©amberpasillas2010 Multiply ½ times 2/3 x = ½ 2/3

13 copyright©amberpasillas2010 Multiply ½ times 2/3 x = ½ 2/3 = 2/6 = 1/3

14 copyright©amberpasillas2010 Multiplying Fractions Model 9 out of 20 boxes shaded

15 copyright©amberpasillas2010 Area Model for Multiplication 2 out of 12 boxes shaded

16 copyright©amberpasillas2010 You are going to get a new study guide titled MULTIPLY FRACTIONS MODEL You can use this on your test! Take a look at the 1 st example!

17 copyright©amberpasillas2010 If I have one-third of a one-half piece, how much will I have compared to a whole square? Draw one-third (horizontal) Draw one-half (vertical) 1313 1212 What is 1/3 of ½? Draw a picture.

18 copyright©amberpasillas2010 If I have one-third of a one-half piece, how much will I have compared to a whole square? Draw one-third (horizontal) Draw one-half (vertical) 1313 1212 What is 1/3 of ½? Draw a picture.

19 copyright©amberpasillas2010 If I have one-third of a one-half piece, how much will I have compared to a whole square? Draw one-third (horizontal) Draw one-half (vertical) 1313 1212 What is 1/3 of ½? Draw a picture. NOW TRY EXAMPLE#2 We will do this together. Watch as I show you how to do it.

20 copyright©amberpasillas2010 Try example # 2 on the front right side.

21 copyright©amberpasillas2010 Follow the examples shown to solve each fraction problem. Draw a picture, label it, and circle your answer.

22 copyright©amberpasillas2010 1) Two-thirds times one-fourth? Try the rest of your study guide. I will ask for volunteers in about 5 minutes.

23 copyright©amberpasillas2010 Study Guide ANSWERS

24 copyright©amberpasillas2010 Multiplying Fractions

25 copyright©amberpasillas2010 –18 6 = –2(9) 3(2) Simplify. –3 = Multiply numerators. Multiply denominators. 1212 2323 – Multiplying Fractions 4 Write4 as an improper fraction. 1212

26 copyright©amberpasillas2010 Cross Canceling Cross-Canceling- Reducing before you multiply.

27 copyright©amberpasillas2010 Cross Canceling

28 copyright©amberpasillas2010 Take Out Your Study Guide!!!

29 copyright©amberpasillas2010 Draw one-third ( horizontal ) Draw negative one-half ( vertical ) 1313 2 What is of ? Draw a picture (overlay them). #14 + – = –

30 copyright©amberpasillas2010 Multiply 4 3 7 2 = 28 6 6)6) 4 24 4 = 2 3 4 You do NOT need common denominators Multiply the numerators and denominators straight across. #15 Change the improper fraction to a mixed number 4 6 ÷ ÷ 2 2 Reduce! 4 4 6

31 copyright©amberpasillas2010 Extras

32 Multiplying Fractions

33 copyright©amberpasillas2010 Multiplying Fractions

34 copyright©amberpasillas2010 Draw one-third ( horizontal ) Draw one-half ( vertical ) 1313 1 2 What is of ? Draw a picture (overlay them). # Extra


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