15
with regrouping Woo hoo!

Subtracting Fractions

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Subtracting Fractions. with regrouping. Woo hoo!. First………let’s remember this from last year………. How to change a mixed number to an improper fraction. Multiply the whole number times the denominator. Add your answer to the numerator. Put your new number over the denominator. 1. 9. +. - PowerPoint PPT Presentation

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Page 2: Subtracting Fractions

First………let’s remember this from last year………

Page 3: Subtracting Fractions

How to change a mixed number to an improper fraction

• Multiply the whole number times the denominator.

• Add your answer to the numerator.

• Put your new number over the denominator.

4 12x+=92

REMEMBER POPCORN.........

??

Page 4: Subtracting Fractions

Change this mixed number to an improper fraction

• Multiply the whole number times the denominator.

• Add your answer to the numerator.

• Put your new number over the denominator.

6 23x+=203

Page 5: Subtracting Fractions

Change this mixed number to an improper fraction

• Multiply the whole number times the denominator.

• Add your answer to the numerator.

• Put your new number over the denominator.

3 25x+=175

Page 6: Subtracting Fractions

Change this mixed number to an improper fraction

• Multiply the whole number times the denominator.

• Add your answer to the numerator.

• Put your new number over the denominator.

4 34x+=194

Page 7: Subtracting Fractions

Change this mixed number to an improper fraction

• Multiply the whole number times the denominator.

• Add your answer to the numerator.

• Put your new number over the denominator.

8 35x+=435

Page 8: Subtracting Fractions

Excellent!!!!

Let’s keep moving…….

Page 9: Subtracting Fractions

What if I’m supposed to What if I’m supposed to subtract a larger fraction from subtract a larger fraction from a smaller fraction?_________a smaller fraction?_______________________________________________________

7 18

3 38

-

61 9

8

68

3 = 3344

33

10

4-

4979

91

13 9

5 69

= 5 23

x

+

x

+

Page 10: Subtracting Fractions

Can you regroup with unlike denominators?

Watch this!Watch this!9

55-

223357

2121

2121

3

811 3535

2121

20202121

Sure, but first find the LCD and equivalent fractions.

x 7

x 7

x 3

x 3

1414

1515

Page 11: Subtracting Fractions

Let’s see that again!

Watch this!Watch this!

6

33-

225534

2

5

13132020

Remember, first find the LCD and equivalent fractions. 2020

2020

11 28282020x 4

x 5

x 5

88

1515

x 4

Page 12: Subtracting Fractions

How about these!

6

3 28-

9

5-

07

47

5

1 8 8

2 68

= 2 34

81 7

7

3 37

08

If you have a whole number, make a fraction make a fraction with 0 in the numerator and the same with 0 in the numerator and the same denominatordenominator the mixed number has.

Then regroup as we have before!

Remember to simplify if you need to.

Page 13: Subtracting Fractions

Now, you try!!!!Now, you try!!!!

7 14

3 38

-

61

10 8

78

3

10

4-

4679

91 30

18

5 1618

= 5 89

2 8

121814 18

=38

= =

=

= =

Page 14: Subtracting Fractions

Your turn!!!!

9

1 26-

15

6-

09

49

8

1 6 6

7 46

= 7 23

141 9

9

8 59

06

Page 15: Subtracting Fractions

**Assignment**WS C-48

Do your best!