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Use knowledge of addition to add commonly used prices efficiently
I can use knowledge of addition to add commonly used prices efficiently
Lesson 5 of 10
New
New
- Year 4
Use knowledge of addition to add commonly used prices efficiently
I can use knowledge of addition to add commonly used prices efficiently
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
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.
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.
This is an excellent opportunity to promote and revisit mental and informal calculation strategies which are often more efficient than columnar methods. Take every opportunity to promote efficiency in this lesson.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the closest multiple of 10 to 59?
What is the closest multiple of 10 to 59?
50
100
Q2.What is the closest multiple of 100 to 299?
What is the closest multiple of 100 to 299?
Q3.What is the closest multiple of 100 to 315?
What is the closest multiple of 100 to 315?
Q4.What are the addend(s) in 3 + 4 = 7?
What are the addend(s) in 3 + 4 = 7?
+
=
7
Q5.45 + 29 =
45 + 29 =
Q6.2.9 + 2.9 =
2.9 + 2.9 =
Assessment exit quiz
6 Questions
Q1.Use an adjusting strategy to solve this: 59 p + 37 p = p
Use an adjusting strategy to solve this: 59 p + 37 p = p
Q2.Use the redistributing strategy to solve this: £0.26 + £0.59 = £
Use the redistributing strategy to solve this: £0.26 + £0.59 = £
Q3.65 p + 99 p = £
65 p + 99 p = £
Q4.£1.99 + £4.45 = £
£1.99 + £4.45 = £
Q5.35 p + 49 p = 34 p + 50 p is an example of which strategy?
35 p + 49 p = 34 p + 50 p is an example of which strategy?
Column addition
Rounding and adjusting
Q6.£3.38 + £1.99 = £3.38 + £2 - 1 p is an example of which strategy?
£3.38 + £1.99 = £3.38 + £2 - 1 p is an example of which strategy?
Column addition
Redistributing
