Year 10
Foundation

Year 10
Foundation

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## Lesson details

### Key learning points

1. In this lesson, we will learn how to estimate the answer to a calculation by rounding all the values to one significant figure before calculating.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
What is the upper bound of 21 cm rounded to the nearest centimetre?
20.5 cm
21.4 cm
21.49 cm
Q2.
The population of Yorkshire is 5 400 000 to two significant figures, what is the greatest possible number of people who live in Yorkshire?
5 400 500
5 450 000
5 500 000
Q3.
What is the lower bound for 120, rounded to the nearest 5?
115
115.5
119.5
Q4.
A rectangle has sides of 5.6 cm and 8.4 cm rounded to the nearest millimetre. What is the lower bound for the perimeter?
13.9 cm
14.1 cm
28.2 cm
Q5.
The side length of a square is rounded to the nearest tenth of a centimetre and used to calculate its area of 38.44 cm². What is the lower bound for the perimeter of the square?
6.15 cm
6.2 cm
9.61 cm

## Exit quiz

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### 5 Questions

Q1.
Which calculation would we do to estimate the answer to 467 ÷ 0.48?
400 ÷ 0.4
460 ÷ 0.5
470 ÷ 0.5
Q2.
2. Estimate the answer to 34 x 890
24 000
30 260
32 000
Q3.
3. Estimate the answer to 273 ÷ (0.64 + 0.853)
180
20