New
New
Year 1

# Partition a whole into two parts and write as a subtraction equation

I can partition a whole into two parts and express this as a subtraction equation.

New
New
Year 1

# Partition a whole into two parts and write as a subtraction equation

I can partition a whole into two parts and express this as a subtraction equation.

Share activities with pupils
Share function coming soon...

## Lesson details

### Key learning points

1. When the whole and one part of the whole is known, subtraction can be used to find the missing part.
2. This can be represented with a subtraction equation.
3. The minus sign can be used to show that one part has been split or separated from the whole group.

### Common misconception

Children may forget to start with the whole group when writing subtraction equations.

Maintain a strong focus throughout on what the numbers in equations represent. Explore mistakes that are made to clarify understanding.

### Keywords

• Subtract - To separate or take away one number from another, or to decrease an amount.

• Minus sign - The symbol in an equation which shows that a number has been partitioned, taken away or decreased.

This lesson teaches the partitioning structure of subtraction. It is important not to refer to subtract as 'taking away' in this context. Stress the link between the abstract and concrete by highlighting what each number in an equation represents.
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.
Izzy has 10 cubes altogether. How many are hidden under the pot? Complete the equation to show how many are hiding under the pot. 8 +___= 10
Correct Answer: 2, two
Q2.
Match the equation to the correct addend to complete the equation correctly.
Correct Answer:4 + _ = 7,3

3

Correct Answer:8 = 7 + _,1

1

Correct Answer:0 + _ = 9,9

9

Q3.
Use the number pattern to fill in the missing part.
Correct Answer: 5, five
Q4.
Jun wants to balance these scales so both sides are equal. What number will he have to write in the triangle?
Correct Answer: 2, two
Q5.
Izzy has 8 pennies altogether. She has 2 in one pocket. Complete the equation to show how many she has in the other pocket? _ + 2 = 8
10
Q6.
5 birds are on the branch and the rest are hidden. There are fewer than 7 birds altogether. Which of these numbers must be the missing part? _ + 5
4
2

## Exit quiz

### 6 Questions

Q1.
Look at the picture. How many dogs are to be subtracted from the whole?
Correct Answer: 1, one
Q2.
Use the picture to complete the equation 7 – 3 = _
Correct Answer: 4, four
Q3.
There are 8 teddies. 2 belong to Izzy, and 6 do not belong to Izzy. Which pictures could represent this story?
Correct Answer: An image in a quiz
Correct Answer: An image in a quiz
Q4.
Which picture shows a whole of 6?
Correct Answer: An image in a quiz
Q5.
Look at the picture and say whether the following is true or false. 2 is the whole.
True