1

STANDARD 1.2

DIVIDING FRACTIONS

PROBLEM 1

PROBLEM 3PROBLEM 2

PROBLEM 4

A pizza riddle?

What is the rule to divide fractions?

END SHOW

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2

1.2 Add, subtract, multiply and divide rational numbers and take positive rational numbers to whole-number powers

1.2 Sumar, restar, multiplicar y dividir números racionales y elevar números positivos racionales a potencias de enteros.

GRADE 7: Number Sense

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3

STANDARD 1.2

Rose owns a pizzeria. She wants to know how many slices of a circle can she obtain from of a circular pizza?

34

18 = 6

OR

183

4

1 2 3 4 5 6

1

23

4

56

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4

STANDARD 1.212

212

How many times does fit into ?12

212

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5

STANDARD 1.212

212

How many times does fit into ?12

212

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6

STANDARD 1.212

212

How many times does fit into ?12

212

1 2 3

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7

STANDARD 1.212

212

= 3 3How many times does fit into ?12

212

1 2 3

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8

STANDARD 1.223

112

How many times does fit into ?23

112

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9

STANDARD 1.223

112

How many times does fit into ?23

112

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10

STANDARD 1.223

112

How many times does fit into ?23

112

1 2 3 4 5 6 7 8

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11

STANDARD 1.2

= 8 823

112 How many times does fit into ?2

3 112

1 2 3 4 5 6 7 8

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12

STANDARD 1.234

312

How many times does fit into ?34

312

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13

STANDARD 1.234

312

How many times does fit into ?34

312

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14

STANDARD 1.234

312

How many times does fit into ?34

312

1 2 3

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15

STANDARD 1.2

= 3 334

312 How many times does fit into ?3

4 312

1 2 3

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16

STANDARD 1.214 How many times does fit into ?1

4 1 6

16

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17

STANDARD 1.214 How many times does fit into ?1

4 1 6

16

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18

STANDARD 1.214 How many times does fit into ?1

4 1 6

16

1

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19

STANDARD 1.214 How many times does fit into ?1

4 1 6

16

1

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20

STANDARD 1.214 How many times does fit into ?1

4 1 6

16

112

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21

STANDARD 1.214 How many times does fit into ?1

4 1 6

16 =1

12 1

12

112

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22

STANDARD 1.2

Is it a way of solving all these problems without fraction bars?

=12

= 23

=34

=14

=1X12

2X212 4

=

= 3

=2X12

3X124 3

=

= 8

12 4

=

= 3

= 1X6

4X1 6 4

=

6 41

42

= 1 2 4

....

22 = 1 1

2

= 1 1 2

12

212

12 2

23

112

12 1

34

312

12 3

14

16

6 1

Multiply by the reciprocal

Multiply by the reciprocal

Multiply by the reciprocal

Multiply by the reciprocal

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