Starter quiz
- What is the closest multiple of 10 to 59?
- 50
- 60 ✓
- 100
-
- What is the closest multiple of 100 to 299?
- '300' ✓
- What is the closest multiple of 100 to 315?
- '300' ✓
- What are the addend(s) in 3 + 4 = 7?
- 3 ✓
- +
- 4 ✓
- =
- 7
-
- 45 + 29 = ______
- '74' ✓
- 2.9 + 2.9 = ______
- '5.8' ✓
Exit quiz
- Use an adjusting strategy to solve this: 59 p + 37 p = ______ p
- '96 ' ✓
- Use the redistributing strategy to solve this: £0.26 + £0.59 = £______
- '£0.85' ✓
- 65 p + 99 p = £______
- '£1.64' ✓
- £1.99 + £4.45 = £______
- '£6.44' ✓
- 35 p + 49 p = 34 p + 50 p is an example of which strategy?
- Column addition
- Redistribution ✓
- Rounding and adjusting
-
- £3.38 + £1.99 = £3.38 + £2 - 1 p is an example of which strategy?
- Column addition
- Redistributing
- Rounding and adjusting ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Prices are often 1p or £1 lower than the next whole number of pounds so £2.99 not £3.00
- A number line supports rounding and adjusting strategies
- You might round one addend or all the addends
- Adjust the answer according to the rounding
Common misconception
Pupils use inefficient calculation strategies such as always using columnar methods.
Promote efficient mental strategies and model clear examples of the use of these.
Keywords
Addend - An addend is a number added to another number.
Round - When you round a number, you are making a number less accurate, but keeping it close to its original value.
Adjust - When you adjust a number you make a small change to it.
Redistribution - Redistribution is where part of one addend is moved to another addend.
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