New
New
Use estimation to support accurate calculation
I can use estimation to support accurate calculation
Lesson 5 of 5
New
New
- Year 5
Use estimation to support accurate calculation
I can use estimation to support accurate calculation
Lesson details
Key learning points
- Use times tables and place value to estimate the product of a 3-digit by a 1-digit multiplication.
- Use expanded short multiplication to multiply a 3-digit by a 1-digit number.
- Use short multiplication to multiply a 3-digit by a 1-digit number.
Keywords
Expanded multiplication - A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.
Short multiplication - A way of recording using columns to set out and calculate a multiplication.
Estimate - To find a value that is close enough to the right answer, usually with some thought or calculation involved.
Common misconception
Pupils attempt to estimate using approximations that do not allow for quick mental calculation.
Spend time estimating yourself and modelling the simplicity of it. Use estimations regularly to check the magnitude of an answer.
Estimation is a valuable skill to support checking answers. Take time to model estimation and checking final calculations against these to support pupils in seeing the value of estimating.
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.Match the equation the product.
Match the equation the product.
Q2.Which multiples of 10 is 47 between?
Which multiples of 10 is 47 between?
30 and 40
50 and 60
Q3.Which multiples of 100 is 256 between?
Which multiples of 100 is 256 between?
100 and 200
240 and 340
Q4.26 × 4 Use the expressions. The answer will be between 80 and .
26 × 4 Use the expressions. The answer will be between 80 and .
Q5.True or false: 3 × 30 < 3 × 34
True or false: 3 × 30 < 3 × 34
False
Q6.Estimate and record your calculation as an informal or formal strategy. Eric buys 4 football tickets at £32 each. He then sells 1 at a discounted price of £29. How much did he spend in total? £
Estimate and record your calculation as an informal or formal strategy. Eric buys 4 football tickets at £32 each. He then sells 1 at a discounted price of £29. How much did he spend in total? £
Assessment exit quiz
6 Questions
Q1.Which multiples of 100 is 447 in between?
Which multiples of 100 is 447 in between?
300 and 450
400 and 450
500 and 600
Q2.Match the sentence stems to the correct inequalities expression
Match the sentence stems to the correct inequalities expression
Q3.Estimate the numbers that the answer will be between for the value of the expression 547 × 3
Estimate the numbers that the answer will be between for the value of the expression 547 × 3
15 and 18
150 and 180
15000 and 18000
Q4.Choose an appropriate estimation for the value of the expression 471 × 4
Choose an appropriate estimation for the value of the expression 471 × 4
Between 1200 and 1600
Between 160 and 200
Between 1200 and 1660
Q5.Estimate the numbers that the answer will be between for the value of the expression: 647 × 7
Estimate the numbers that the answer will be between for the value of the expression: 647 × 7
Q6.Eric buys 6 football tickets at £304 each. He then sells 1 at a discounted price of £299. How much did he spend altogether? £
Eric buys 6 football tickets at £304 each. He then sells 1 at a discounted price of £299. How much did he spend altogether? £
