Choose exam board for KS4 Computer Science (GCSE)
Choose exam board for KS4 English
Choose exam board for KS4 French
Choose exam board for KS4 Geography
Choose exam board for KS4 German
Choose exam board for KS4 History
Choose tier for KS4 Maths
Choose exam board for KS4 Music
Choose exam board for KS4 Physical education (GCSE)
Choose exam board for KS4 Religious education (GCSE)
Choose exam board for KS4 Spanish

Use knowledge of calculating 50%, 10% and 1% of a number to solve problems in a range of contexts

Lesson details

Learning outcome

I can calculate 50%, 10% and 1% of a number and use this to solve problems.

Key learning points

  1. To find 50% of a number, halve it.
  2. To find 10% of a number, divide it by 10
  3. To find 1% of a number, divide it by 100

Keywords

  • Percentage - A percentage is a proportion of a whole.

Common misconception

Pupils may struggle when finding 10% or 1% of numbers that include zero.

Draw attention to zero being a placeholder within specific numbers. Some pupils may still need to use resources such as number cards and place value charts to physically move the digits to develop their confidence in dividing by 10 and 100

Teacher tip

Pupils need to be competent dividing numbers, including decimal numbers, by 10 and 100 prior to this lesson. Draw attention to finding 50% as being equivalent to diving by 2 or finding half, and finding 10% as being equivalent to dividing by 10 or finding one-tenth.

Licence

This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions
(Collection 2).

Lesson video

Loading...

Prior knowledge starter quiz

6 Questions

Q1.
Percent means the number of parts in each .

Correct Answer: 100, hundred, one hundred

Q2.
Look at the image. What is the missing numerator?

An image in a quiz
Correct Answer: 20

Q3.
$$ {5} \over {20} $$ of the beads in the bracelet are purple. What percentage of the beads is this?

An image in a quiz
5%
20%
Correct answer: 25%
50%

Q4.
Match the percentages and fractions.

Correct Answer:80%,$$ {4} \over {5} $$

$$ {4} \over {5} $$

Correct Answer:70%,$$ {7} \over {10} $$

$$ {7} \over {10} $$

Correct Answer:25%,$$ {1} \over {4} $$

$$ {1} \over {4} $$

Q5.
Match the decimals and percentages.

Correct Answer:0.19,19%

19%

Correct Answer:0.09,9%

9%

Correct Answer:0.9,90%

90%

Correct Answer:0.3,30%

30%

Q6.
Look at the sets of fractions, decimals and percentages. Which set is correct?

75% = 0.75 = $$ {2} \over {4} $$
Correct answer: 75% = 0.75 = $$ {3} \over {4} $$
75% = 0.075 = $$ {3} \over {4} $$

6 Questions

Q1.
How do we calculate the percentages shown here?

Correct Answer:50% of a number ,Halve the number

Halve the number

Correct Answer:10% of a number ,Divide the number by 10

Divide the number by 10

Correct Answer:1% of a number ,Divide the number by 100

Divide the number by 100

Q2.
One of the stages of the Tour de France race is 170 km long. Match the percentage of the race to the number of km.

Correct Answer:100% of 170 km,170 km

170 km

Correct Answer:50% of 170 km,85 km

85 km

Correct Answer:10% of 170 km,17 km

17 km

Correct Answer:1% of 170 km,1.7 km

1.7 km

Q3.
A different stage of the Tour de France is 208 km long. If a rider has completed 1% of the race, how far have they ridden?

20.8 km
28 km
0.28 km
Correct answer: 2.08 km

Q4.
If 100% of a number is 1,500, what is 1% of the number?

Correct Answer: 15

Q5.
If 10% of a number is 23.5, what is 100% of the number?

Correct Answer: 235

Q6.
50% of a number is 56 Use this fact to find the other percentages.

An image in a quiz
Correct Answer:100%,112

112

Correct Answer:10%,11.2

11.2

Correct Answer:1%,1.12

1.12


To help you plan your 6 maths lesson on: Use knowledge of calculating 50%, 10% and 1% of a number to solve problems in a range of contexts, download all teaching resources for free and adapt to suit your pupils' needs...