Use estimation to support accurate calculation | Maths

Starter quiz

Match the equation the product.

7 × 2

⇔

14 ✓

3 × 6

⇔

18 ✓

7 × 9

⇔

63 ✓

3 × 7

⇔

21 ✓

7 × 10

⇔

70 ✓
Which multiples of 10 is 47 between?

30 and 40

40 and 50 ✓

50 and 60
Which multiples of 100 is 256 between?

100 and 200

200 and 300 ✓

240 and 340
26 × 4 Use the expressions. The answer will be between 80 and ______.

'120' ✓
True or false: 3 × 30 < 3 × 34

True ✓
False
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? £______

'99' ✓

Which multiples of 100 is 447 in between?

300 and 450

400 and 450

400 and 500 ✓

500 and 600
Match the sentence stems to the correct inequalities expression

345 is between 300 and 400

⇔

300 < 345 < 400 ✓

443 is between 400 and 500

⇔

400 < 443 < 500 ✓

697 is between 600 and 700

⇔

600 < 697 < 700 ✓

801 is between 800 and 900

⇔

800 < 801 < 900 ✓
Estimate the numbers that the answer will be between for the value of the expression 547 × 3

15 and 18

150 and 180

1500 and 1800 ✓

15000 and 18000
Choose an appropriate estimation for the value of the expression 471 × 4

Between 1600 and 2000 ✓

Between 1200 and 1600

Between 160 and 200

Between 1200 and 1660
Estimate the numbers that the answer will be between for the value of the expression: 647 × 7

'4200 and 4900' ✓
Eric buys 6 football tickets at £304 each. He then sells 1 at a discounted price of £299. How much did he spend altogether? £______

'1,525' ✓

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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.

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.

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.