GCSE · Rounding & bounds

Rounding and significant figuresExam-style questions

Why significant figures count information rather than decimal places, why the count starts at the first non-zero digit, and why place value must survive the rounding.

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16 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAll Level 1 Level 2 Level 3 Level 4 Level 5

1
The mass of a parcel is 340 g, correct to the nearest 10 g. Write down the error interval for the mass $m$ .
Level 4 · 2 marksTry it
2
A number $y$ is truncated to 1 decimal place. The result is 8.4. Write down the error interval for $y$ .
Level 4 · 2 marksTry it
3
The number of people at a concert is 2400, correct to the nearest 100.

(a) Write down the least possible number of people.

(b) Write down the greatest possible number of people.
Level 4 · 2 marksTry it
4
$x = 460$ , correct to $2$ significant figures.

Write down the error interval for $x$ .
Level 4 · 2 marksTry it
5
A number $y$ is truncated to a whole number. The result is $23$ .

Write down the error interval for $y$ .
Level 4 · 2 marksTry it