Use the additive relationship to rearrange addition equations
I can rearrange addition equations.
Use the additive relationship to rearrange addition equations
I can rearrange addition equations.
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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.
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.
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.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is 15 + 10 =
Q2.What is 400 + 100 = ___
Q3.What is 5 + 3 + 5 =
Q4.What is 60 + 60 =
Q5.What is the missing number: 47 + 3 = ___
Q6.Which calculation gives the largest total?
Assessment exit quiz
6 Questions
Q1.What is the sum of 40 and 50?
Q2.What are the addends in this equation: 130 + 80 = 210
Q3.Which equations are represented by the bar model?
Q4.Look at the bar model. What is the missing sum?
Q5.Which pairs of addends could complete the bar model?
Q6.Which pairs of addends could complete the bar model?
