Starter quiz
- Select the values that could be labelled as parts in this equation: 980 = 100 + 880
- 980
- 100 ✓
- 880 ✓
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What is the missing addend in this bar model?- '16' ✓
- 0.8 + 0.15 + 0.05 = 1 Which other combination of three parts has the same whole?
- 0.9 + 0.15 + 0.01
- 0.9 + 0.05 + 0.05 ✓
- 0.6 + 0.25 + 0.15 ✓
- 0.7 + 0.05 + 0.05
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Complete this equation. bl = lg + ______ × w- '6' ✓
- Alex was training for a swimming race. On Monday he swam 1,500 m. On Wednesday he swam 1,350 m and on Friday he swam 1,500 m. How far did he swim?______ m
- '4,350' ✓
Complete the column addition to find the sum.- '31.55' ✓
Exit quiz
This model has one unknown. What is the correct missing part?
True or false. If there are three parts equivalent to the blue rod, there is only solution for the missing part.- True ✓
- False
Which equation represents this image?- p + w + ___ = bl ✓
- p + bl + w = ___
- bl + ___ + p = w
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Which equations represent this image?- lg + ___ + lg + w = o ✓
- o + lg + lg = w + ___
- o = lg + lg + w + ___ ✓
- o = 2 × lg + w + ___ ✓
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There is only one known part in this bar model. How many possible unknown parts could there be?- 0
- 1 ✓
- 2 ✓
- 3 ✓
- 4 ✓
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Tick the equations that could represent this bar model.- r + r + w + w + w + ___ = o ✓
- 2 × r + 3 × w + ___ = o ✓
- 2 × r + 3 × w + ___ + ___ = o ✓
- o = w + w + r + r + r + ___
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- A representation helps to identity the parts and wholes.
- A representation helps to identify a missing part.
- A representation helps to identify the calculation needed to find the missing part.
Common misconception
Pupils think that the missing part(s) must be a different colour rod to those parts already used within the example.
Provide pupils with various examples, in particular examples where there are two or more of the same part, drawing on the repeated addition/multiplicative structure not just the additive structure.
Keywords
Equivalent - Two or more things are equivalent if they have the same value.
Solution - A solution is a value, or set of values, that can be put in place of an unknown which makes the equation true.
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