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Reciprocal

How to find reciprocal

What is the use of reciprocal

Reciprocal

How to find reciprocal

What is the use of reciprocal

1.
Reciprocals

A reciprocal is the value used to multiply a number by

to make the product 1

Find the reciprocal of 2:

1 What do we multiply 2 by to get

2x =1

2 a product of 1?

Why? Think of multiplying fractions 2 x 1 = 2 = 1

1 2 2

Find the reciprocal of :

1 2

x 2 = 1 Multiplication is commutable

2

Find the reciprocal of 3:

1 What do we multiply 3 by to get

3x =1

3 a product of 1?

Find the reciprocal of 10:

1 What do we multiply 10 by to get

10 x 10

=1 a product of 1?

A reciprocal is the value used to multiply a number by

to make the product 1

Find the reciprocal of 2:

1 What do we multiply 2 by to get

2x =1

2 a product of 1?

Why? Think of multiplying fractions 2 x 1 = 2 = 1

1 2 2

Find the reciprocal of :

1 2

x 2 = 1 Multiplication is commutable

2

Find the reciprocal of 3:

1 What do we multiply 3 by to get

3x =1

3 a product of 1?

Find the reciprocal of 10:

1 What do we multiply 10 by to get

10 x 10

=1 a product of 1?

2.
Reciprocals

3

Find the reciprocal of 4

:

3 x 4 =1 What do we multiply 3 by to get

4 3 4

a product of 1?

Remember how to multiply fractions: 3 x 4 = 12 =1

4 3 12

Find the reciprocal of 0.7 :

7 x 10 = 1

0.7 = 7

10 10 7

10 3

Now change into a mixed number 17

7

So the reciprocal of 0.7 is 13

7

3

Find the reciprocal of 4

:

3 x 4 =1 What do we multiply 3 by to get

4 3 4

a product of 1?

Remember how to multiply fractions: 3 x 4 = 12 =1

4 3 12

Find the reciprocal of 0.7 :

7 x 10 = 1

0.7 = 7

10 10 7

10 3

Now change into a mixed number 17

7

So the reciprocal of 0.7 is 13

7

3.
Reciprocals

Find the reciprocal of 2 2

3

First write the mixed number as a top heavy fraction

8 3

then follow the same process 8

3

Now you know the principles the shortcut to finding a reciprocal

is to swap the numerator and denominator over

8 x =1

3

Find the reciprocal of 2 2

3

First write the mixed number as a top heavy fraction

8 3

then follow the same process 8

3

Now you know the principles the shortcut to finding a reciprocal

is to swap the numerator and denominator over

8 x =1

3

4.
Reciprocals

Now do these

Find the reciprocals of:

1. 6

1

7.

3 3 23

6 11

2. 7 1

8. 0.3 3 13

7

3. 0.25 4 9. 0.125 8

1 3 4

4. 8 10. 1 7

8 4

1 4

5. 12 11. 1.25 5

12

2 1

. 3

6. 3 12. 1.6 5

7 2

Now do these

Find the reciprocals of:

1. 6

1

7.

3 3 23

6 11

2. 7 1

8. 0.3 3 13

7

3. 0.25 4 9. 0.125 8

1 3 4

4. 8 10. 1 7

8 4

1 4

5. 12 11. 1.25 5

12

2 1

. 3

6. 3 12. 1.6 5

7 2