KS3 Fractions & Percentages of an Amount

KS3 Fractions & Percentages of an Amount

Multiple Choice

21 divided by 3 =_____

• 3

• 63

• 5

• 7

Multiple Choice

To calculate 25% of a given amount you work out.

• Given amount divided by 25.

• 4 divided by the given amount.

• 25 divided by the given amount.

• Given amount divided by 4.

Multiple Choice

12 divided by 3 =_____

• 36

• 4

• 5

• 7

Multiple Choice

49 divided by 7 =____

• 8

• 7

• 2

• 1

Multiple Choice

36 divided by 6 = _____

• 8

• 36

• 1

• 6

Multiple Choice

81 divided by ____ = 9

• 8

• 9

• 7

• 81

Multiple Choice

8 x 9

• 81

• 72

• 56

• 63

Multiple Choice

7 x 8

• 54

• 56

• 63

• 48

Multiple Choice

6 x 8

• 36

• 56

• 48

• 54

Multiple Choice

6 x 7

• 42

• 36

• 48

• 54

Multiple Choice

What is 1/3 of 48?

• 24
• 12
• 16
• 96

Multiple Choice

What is 1/5 of 25?

• 5
• 125
• 50
• 15

Multiple Choice

What is half of 24?

• 4
• 6
• 48
• 12

Finding Fractions of an amount

Fractions are made of a

 $\frac{numerator}{deno\min ator\ }$  

Finding Fractions of an amount

To find a fraction of an amount we must ALWAYS

Divide by the Denominator

Multiply by the Numerator

Finding Fractions of an amount

 $\frac{1}{2}$  of 20

 $20\div2=10$  
 $10\times1=10$  

Finding Fractions of an amount

 $\frac{3}{5}$  of 20

 $20\div5=4$  
 $4\times3=12$  

Fill in the Blanks

 $\frac{3}{5}$  of 35

 $35\div5=7$  

 $7\times3=$  

Fill in the Blanks

 $\frac{4}{5}$  of 35

 $35\div5=7$  

 $7\times4=$  

Fill in the Blanks

 $\frac{4}{3}$  of 9

 $9\div3=3$  

 $3\times4=$  

Fill in the Blanks

 $\frac{7}{10}$  of 80

 $80\div10=8$  

 $8\times7=$  

Multiple Choice

What is 3/4 of 60?

• 12
• 15
• 45
• 75

Multiple Choice

Find ⁵/₈ of $64

• $40

• $32

• $42

• $35

Multiple Choice

Find ⁴/₉ of $54

• $20

• $24

• $18

• $30

Multiple Choice

5/9 of 45 is? 

• 20
• 35
• 30
• 25

Finding Percentages 

of an amount

 $100\%$  

Percentages are fractions out of 100 (per 100)

E.g.  $30\%\ =\ \frac{30}{100}$  

Finding Percentages 

of an amount

E.g.  $30\%\ =\ \frac{30}{100}$  

This means we can ALWAYS divide by 100, then multiply by 30

Finding Percentages 

of an amount

TRICKS!

10% - Divide by 10
50% - Divide by 2

Fill in the Blanks

Find 10% of 320

Fill in the Blanks

Find 10% of 450

Fill in the Blanks

Find 10% of 570

Fill in the Blanks

Find 10% of 200

Fill in the Blanks

Find 10% of 54

(use decimals)

Fill in the Blanks

Find 10% of 86

(use decimals)

Open Ended

If  $10\%$  of a number is 50
What can I do to find  $5\%$  

Fill in the Blanks

If  $10\%$  of a number is 50
What is  $5\%$  

Fill in the Blanks

If  $10\%$  of a number is 8
What is  $5\%$  

Multiple Choice

What is 10% of 54kg

• 54kg

• 0.54kg

• 5.4kg

• 540kg

Multiple Choice

What is 5% of 54kg

• 54kg

• 2.7kg

• 5.4kg

• 0.54kg

Multiple Choice

What is 10% of 360cm

• 12cm

• 36cm

• 3.6cm

• 120cm

Multiple Choice

What is 30% of 360cm

• 12cm

• 108cm

• 10.8cm

• 120cm

Multiple Choice

What is 10% of £250?

• £25

• £2.50

• £0.25

• £250

Multiple Choice

What is 1% of £250?

• £25

• £2.50

• £0.25

• £250

Multiple Choice

A TV has a sale price of 10% off. The original price was £260.

What is 10% of £260?

• £65

• £2.60

• £26

• £75

Multiple Choice

A TV has a sale price of 10% off. The original price was £260.

What is the sale price?

• £200

• £224

• £284

• £234