Starter quiz
Calculate the missing whole in this bar model.- '1,350' ✓
- What is the unknown? Jacob watches television for 1 hour and 20 minutes. He watches the news, a cartoon and a wildlife show. The cartoon is 20 minutes long and the wildlife show is 50 minutes long.
- The total time Jacob watches TV for.
- The duration of the cartoon.
- The duration of the wildlife show.
- The duration of the news. ✓
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- Select the worded problem that requires addition to solve it.
- Altogether there are 27 stickers. 12 are shiny. How many are not shiny.
- There are 12 shiny stickers, 15 not shiny. How many more stickers are not shiny?
- There are 12 shiny stickers and 15 not shiny stickers so there are ___ stickers. ✓
- In 27 stickers, there are 3 fewer shiny than not shiny. How many are not shiny?
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- Calculate using an efficient strategy. Lucas buys a cup of tea for £1.59 and a cookie for £1.99 How much does he spend? £______
- '3.58' ✓
Complete the column addition to find the sum.- '6.05' ✓
Complete the column subtraction to find the difference.- '0.71' ✓
Exit quiz
- Which bar model correctly represents this problem? Aisha spent £45, Sofia spent £8 and Izzy spent £32 on different items. How much money did they spend altogether?
Use the bar model to answer the question. Aisha spent £45, Sofia spent £8 and Izzy spent £32 on different items. How much money did they spend altogether? £______ altogether.- '85' ✓
Izzy swam 1.5 km on Monday, 0.7 km on Tuesday and 1.1 km on Wednesday. How far did she swim in total? ______ km- '3.3' ✓
Which problems could be represented by this bar model?- A drink contained 1.5 l of orange juice, 0.9 l of apple juice and 0.4 l of water ✓
- Aisha spent £1.50 on a comic, £4 on a book and 90 p on a pen.
- A recipe contained 1.5 kg of flour, 0.4 kg of sugar and 0.9 kg of butter. ✓
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The addends in this bar model represent the number of pieces in 3 jigsaw puzzles. How many jigsaw pieces are there in total? ______ pieces- '870' ✓
In the drawer of cubes, Sofia found 45 red cubes and the same number of green cubes. There were 105 cubes of other colours. How many cubes were there in total? ______ cubes.- '195' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Bar models represent additive problems with two addends.
- Bar models represent additive problems with three addends.
- Three addends relate to three parts of a whole.
Common misconception
Pupils struggle to represent each problem with an accurate bar model.
You could continue to use number rods to represent each of the problems at first and then draw around these as a second scaffold, however, pupils do need to make the leap to representing as bar models for themselves.
Keywords
Represent - To represent something means to show something in a different way.
Addend - Addends are any numbers added together.
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