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subtraction of like fractions related fractions (Denominators of given fractions should not exceed 12) What will we learn today? Fraction Subtraction

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### Transcript of Kungfu math p4 slide9 (subtraction fraction)pdf

• subtraction of ∗ like fractions

∗ related fractions

• (Denominators of given fractions should not exceed 12)

What will we learn today?

Fraction Subtraction

In the previous lectures, we have learnt about

Mixed Numbers and

Improper Fractions

Let’s recap!

3 simple steps to add fractions:

• Step 1 – Make sure the bottom numbers

(denominators) are the same

• Step 2 – Add the top numbers (numerators), put the

• Step 3 – Simplify the fraction (if necessary).

For example

Simplify the fraction (if necessary).

Try this out!

1. Find the value of . 29

7 + 2

7

Solution

1. Find the value of . 29

7 + 2

7

29

7 + 2

7 =

Step 1 Make sure the bottom numbers (denominators) are the same

Solution

1. Find the value of . 29

7 + 2

7

29

7 + 2

7

29+2

7 =

31

7 =

Step 2 Add the top numbers (numerators), put the answer over the denominator.

Solution

1. Find the value of . 29

7 + 2

7

29

7 + 2

7

29+2

7 =

31

7 = Step 3

Simplify the fraction (if necessary).

= 3

7 4

Applying what we have learnt

3 simple steps to subtract fractions:

• Step 1 – Make sure the bottom numbers

(denominators) are the same

• Step 2 – Subtract the top numbers (numerators),

put the answer over the denominator.

• Step 3 – Simplify the fraction (if necessary).

Try this out!

1. Find the value of . 29

7 - 2

7

Solution

1. Find the value of . 29

7 - 2

7

29

7 - 2

7 =

Step 1 Make sure the bottom numbers (denominators) are the same

Solution

1. Find the value of . 29

7 - 2

7

29

7 - 2

7

29-2

7 =

27

7 =

Step 2 Subtract the top numbers (numerators), put the answer over the denominator.

Solution

1. Find the value of . 29

7 - 2

7

29

7 - 2

7

29-2

7 =

27

7 = Step 3

Simplify the fraction (if necessary).

= 6

7 3

Try this out!

2. Find the value of 1

9 -

2

3 1 -

Try this out!

2. Find the value of 1

9 -

2

3 1 -

Step 1 Make sure the bottom numbers (denominators) are the same

1

9 -

2

3 1 - 1

9 -

2

3 - =

x 3

x 3

9

9

Try this out!

2. Find the value of 1

9 -

2

3 1 -

Step 1 Make sure the bottom numbers (denominators) are the same

1

9 -

2

3 1 - 1

9 -

6

9 - =

9

9

Try this out!

2. Find the value of 1

9 -

2

3 1 - 1

9 -

2

3 1 - 1

9 -

6

9 - =

9

9

9-1-6

9 =

Step 2 Subtract the top numbers (numerators), put the answer over the denominator.

Try this out!

2. Find the value of 1

9 -

2

3 1 - 1

9 -

2

3 1 - 1

9 -

6

9 - =

9

9

9-1-6

9 =

2

9 =

Step 3 Simplify the fraction (if necessary).

Summary

• Step 1 – Make sure the bottom numbers

(denominators) are the same

• Step 2 – Subtract the top numbers (numerators),

put the answer over the denominator.

• Step 3 – Simplify the fraction (if necessary).

Are you ready to try out the questions?

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