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Year 1

Add parts to find the value of the whole and write the equation

I can understand the relationship between equations, part-part-whole models and problems they represent.

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New
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Year 1

Add parts to find the value of the whole and write the equation

I can understand the relationship between equations, part-part-whole models and problems they represent.

Download all resources
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Share activities with pupils
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Lesson details

Key learning points

  1. In an equation, each addend represents a part.
  2. You can combine the addends to find the sum.
  3. To find how many objects there are altogether, you must count both addends.

Keywords

  • Addend - Any of the numbers that are added together.

  • Sum - The result of adding two or more numbers.

  • Altogether - In total, the whole amount.

Common misconception

Children may have difficulty when the sum is presented on the left of the equal sign.

Ensure that equations are arranged with the sum both on the left and the right of equal sign. Use term 'is equal to' to stress equality.

Continually encourage children to describe what each number in an equation represents to consolidate their understanding of the equality in equations and to help them link equations to a range of contexts.
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).

Lesson video

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Starter quiz

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6 Questions

Q1.
What is the whole in this picture?
An image in a quiz
Correct Answer: 10
Q2.
Which equation represents this part-part-whole model?
An image in a quiz
5 = 2 + 7
Correct answer: 5 + 2 = 7
2 + 7 = 5
Q3.
Which equation represents the picture?
An image in a quiz
Correct answer: 8 = 6 + 2
6 + 2 = 7
6 = 2 + 6
Q4.
I have 8 pencils altogether. 6 are red and 2 are yellow. Which equations would represent this?
Correct answer: 6 + 2 = 8
6 = 2 + 8
Correct answer: 8 = 6 + 2
Q5.
Which story could these counters represent?
An image in a quiz
Correct answer: There are 3 bananas and 4 apples. There are 7 pieces of fruit altogether
There are 4 pieces of fruit altogether. 3 of those pieces are apples.
Q6.
Jun has written three equations to match this picture. Which other equation could he write? Do not use a space.
An image in a quiz
Correct Answer: 6=2+4

Exit quiz

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6 Questions

Q1.
Write an equation to represent the part-part-whole model and solve it. Do not use spaces.
An image in a quiz
Correct Answer: 3+5=8 , 5+3=8, 8=3+5, 8=5+3
Q2.
There are 3 pebbles in one box and no pebbles in the other box. Which equation would I write to find out how many pebbles there are altogether? Do not use spaces.
An image in a quiz
Correct Answer: 3+0= , 0+3=, 3+0=3, 0+3=3
Q3.
Which equation can be used to represent this picture?
An image in a quiz
8 = 5 = 3
3 + 5 + 8
5 = 3 + 8
Correct answer: 5 + 3 = 8
Q4.
Izzy has 3 counters and Jun has 5 counters. They combined the parts to find out how many altogether. Which equation could represent this?
Correct answer: 8 = 5 + 3
3 = 5 + 8
8 + 3 = 5
Q5.
Solve this equation. 7 + 2 =
Correct Answer: 9
Q6.
Solve this equation. = 8 + 2
Correct Answer: 10