New
New
Year 1

# Solve problems using a bar model to represent a whole partitioned into two parts

I can solve problems using a bar model to partition a number into two parts.

New
New
Year 1

# Solve problems using a bar model to represent a whole partitioned into two parts

I can solve problems using a bar model to partition a number into two parts.

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## Lesson details

### Key learning points

1. Partitioning of numbers to five can be represented using the bar model.
2. The bar model and the part-part-whole diagram can be used to represent stories.
3. Systematic thinking can be used to ensure all possible responses to a problem can be found.

### Common misconception

As before, children may confuse the whole and the parts, or add them all up to find the total.

Place objects in each part of the bar model and combine them to make the whole, or starting within the whole, partition them into the parts.

### Keywords

• Partition - Partition is to split a whole up into parts.

• Combine - Combine means to put parts together to make a whole.

• Bar model - A bar model is a pictorial representation of a problem where bars are used to represent the whole and the parts.

Play partitioning games and represent using bar models. Use squared paper to encourage children to draw their own bar models, placing counters, cubes or dots in each part to begin with to help them get a sense of the size of the parts.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
Which one of these is showing a bar model?
Correct Answer: An image in a quiz
Q2.
What is the missing part?
2
3
Q3.
Which bar model is showing Sofia’s counters correctly partitioned?
Correct Answer: An image in a quiz
Q4.
Jun has 3 cubes and Sofia has 1 cube. Which bar model is showing their cubes combined?
Correct Answer: An image in a quiz
Q5.
Jun has 2 counters and Sofia has 1 counter. Which bar model is showing their counters combined?
Correct Answer: An image in a quiz
Q6.
Jun is working systematically to find all the ways to partition 3 counters. What does systematically mean?
Correct answer: Finding an order to partition the 3 counters.
Partitioning the counters in any order.

## Exit quiz

### 6 Questions

Q1.
Jun and Sofia have thrown 5 counters. Which bar model is showing their counters?
Correct Answer: An image in a quiz
Q2.
Jun and Sofia have thrown 4 counters. Which bar model is showing their counters?
Correct Answer: An image in a quiz
Q3.
How many more fingers does Sofia need to show?
2
5
Q4.
How many more fingers does Jun need to show?