Student Resource Book |
Year 5 (3A)
Number & Algebra
Chapter 2 | Adding and subtracting using tidy numbers
Overview
Rich tasks
- These are problem solving open-ended questions that require students to investigate adding and subtracting using tidy numbers. The tasks can be given at the start of a topic and done as the students gain enough knowledge to complete them, inserted into a topic at an appropriate place, or given as homework or extension.
- What’s the difference?
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Adding using tidy numbers
- Add numbers by making one number into a tidy number, adding the numbers and then compensating by taking some off.
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Subtracting using tidy numbers
- Subtract numbers by making one number into a tidy number, subtracting the tidy number from the other number and then compensating by adding some back.
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Subtracting by adding the same amount to both numbers
- Subtract numbers by adding the same to both numbers so that the number being subtracted becomes a tidy number.
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Adding and subtracting using tidy numbers close to 100
- Add and subtract by rounding one number to a hundreds number and then compensating by taking some off or adding some back.
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Adding and subtracting by jumping through tidy numbers
- Use jumping through tidy numbers to solve “How many more” or “How many less” problems.
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Adding and subtracting using tidy numbers
- Use one of the tidy number strategies to solve problems involving addition or subtraction.
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