Starter quiz
- What symbols do we make use of when comparing two or more expressions with different values?
- Equals symbol
- Inequalities ✓
- Operations
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What is the unknown in the bar model? £______- '61' ✓
The tally chart shows the number of vegetables sold in a week from a greengrocers. How many were sold altogether?- '80' ✓
- Calculate the following sum using adjustment. £99 + £154 = £______
- '253' ✓
- Calculate the following sum using adjustment. £______ = £1,999 + £2,500
- '4,499' ✓
Use mental strategies to calculate the unknown in the bar model. The unknown is £______- '310' ✓
Exit quiz
- Which of the following best describes the word budget?
- A red briefcase
- Something that is poor quality or value
- The total amount of money you have to spend on something ✓
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- Solve the following addition without using a written method. £6,999 + £1,750 = £______
- '8,749' ✓
- Find the unknown in the equation below. £6,999 + £1,750 + £______ = £10,000
- '1,251' ✓
The chart shows how many vegetables have been sold. Then, 6 more onions, 2 more spring onions and 4 more potatoes were sold. 5 radishes were returned. How many vegetables have been sold now?- '117' ✓
What is the unknown garden part of the budget shown in the bar model? The budget for the garden is £______- '2,501' ✓
The budget was £10,000 and the graph shows the savings and extra costs. Was this over or under budget?- Over budget
- Under budget ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The part-whole structure can be used to represent additive problems in a range of contexts.
- A bar model structure can be used to represent additive problems in a range of contexts.
- The same sum rule can be used to solve additive problems in a range of contexts.
Common misconception
The idea of an extra cost being an addition and a saving being a subtraction can seem counter-intuitive to some children.
Talk through a more basic version using a pound for a budget and sweets at a tuck shop.
Keywords
Budget - A budget is the total amount of money that you have to spend on something. It is often split into parts and money can be redistributed between these parts.
Unknown - An unknown is a quantity that has a set value but it is represented by a symbol or letter.
Adjust - When you adjust you make a change to a number.
Redistribution - Redistribution is where some of one part is moved to another part. It is sometimes known as the same sum rule.
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