New
New
Year 3
Use the additive relationship to rearrange addition equations
I can rearrange addition equations.
New
New
Year 3
Use the additive relationship to rearrange addition equations
I can rearrange addition equations.
Lesson details
Key learning points
- Equations can be represented using part-part-whole or bar models.
- The sum is the whole and the addends are parts.
- Equations can be written starting with the addends or with the sum.
Common misconception
Pupils may struggle starting equations with the sum. They may think = means 'the answer is..'
Ensure that children understand that 'equals' means that the equation balances (i.e. both sides have the same value.) This could be achieved through using balance scales and attaching the idea of equals with balance.
Keywords
Addend - An addend is a number added to another.
Sum - The the total when numbers are added together.
Equation - An equation shows that one number or calculation is equal to another.
Encourage pupils to use the terms 'sum' and 'whole' interchangeably. They should understand that an addend is a part. For extra challenge, pupils can find more than one answer to the open-ended problems in Task B, where they are only given the sum.
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).
Video
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Starter quiz
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6 Questions
Q1.
What is 15 + 10 =
Q2.
What is 400 + 100 = ___
401
410
600
Q3.
What is 5 + 3 + 5 =
Q4.
What is 60 + 60 =
Q5.
What is the missing number: 47 + 3 = ___
40
49
51
Q6.
Which calculation give the largest total?
15 + 3 =
16 + 1 =
Exit quiz
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6 Questions
Q1.
What is the sum of 40 and 50?
Q2.
What are the addends in this equation: 130 + 80 = 210
210
+
Q3.
Which equations are represented by the bar model?
30 + 70 = 110
Q4.
Look at the bar model. What is the missing sum?
Q5.
Which pairs of addends could complete the bar model?
9 and 14
15 and 10
Q6.
Which pairs of addends could complete the bar model?
60 and 120
90 and 90