New
New
Use parts and wholes to find a unit fraction of a set of objects
I can use knowledge of parts and wholes to find a unit fraction of a set of objects.
Lesson 3 of 5
New
New
- Year 3
Use parts and wholes to find a unit fraction of a set of objects
I can use knowledge of parts and wholes to find a unit fraction of a set of objects.
Lesson details
Key learning points
- The whole can be a set of objects.
- To identify the size of a part, we can divide the whole amount by the number of parts.
- To identify the size of the whole, we can multiply the number of equal parts by the size of each part.
- ‘The whole is divided into ___ equal parts. Each equal part is __________ of the whole.'
Keywords
Set - A set is a collection of things (objects or numbers).
Unit fraction - A unit fraction is any fraction where the numerator is one.
Common misconception
Children may struggle to make the connection between the unit fraction and the division required.
The stem sentence, 'The whole is divided into ___ equal parts. Each equal part is __________ of the whole.' supports children to grasp this. Support children to make connections between the number of equal parts and the denominator of the fraction.
Lots of practical experience using number rods will help children to grasp this concept. Use examples including times table facts that children are confident with to reduce the cognitive load.
Teacher tip
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
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Prior knowledge starter quiz
6 Questions
Q1.A whole set of cars is:
A whole set of cars is:
some of them
Q2.What is the whole amount of lemons shown?
What is the whole amount of lemons shown?
Q3.Match the division expressions with their quotient.
Match the division expressions with their quotient.
Q4.Look at this table, and complete the missing section. What is the part as a fraction of the whole?
Look at this table, and complete the missing section. What is the part as a fraction of the whole?
one-third
one-quarter
Q5.Who has the most marbles in their whole set?
Who has the most marbles in their whole set?
Q6.Which whole line is longer?
Which whole line is longer?
Assessment exit quiz
6 Questions
Q1.Which of these fractions are unit fractions?
Which of these fractions are unit fractions?
B
D
Q2.How many equal parts has the whole set of cherries been divided into?
How many equal parts has the whole set of cherries been divided into?
5
20
one-quarter
Q3.What fraction of the whole is each part?
What fraction of the whole is each part?
one-half
one-third
one-fifth
Q4.How many cherries are in each part?
How many cherries are in each part?
Q5.Lucas has 5 pears. This is one-third of the bag of pears. How many pears are in the whole bag?
Lucas has 5 pears. This is one-third of the bag of pears. How many pears are in the whole bag?
Q6.Sofia has 8 counters. This is one-quarter of the bag of counters. How many counters are in the whole bag?
Sofia has 8 counters. This is one-quarter of the bag of counters. How many counters are in the whole bag?
