DfE statement N13 · Number
Standard and compound units
Standard and compound units is content statement N13 of the DfE GCSE mathematics subject content, in the number area. It is on both tiers, and it appears on both the calculator and the non-calculator papers. Below is what the specification actually requires, the 3 mistakes that cost marks on this topic most often, and practice questions written to the statement — original questions, not past papers.
What the specification says
The DfE subject content for GCSE mathematics states, verbatim: "Use standard units of mass, length, time, money and other measures (including standard compound measures) using decimal quantities where appropriate." (statement N13). Every awarding organisation — Pearson Edexcel, AQA and OCR — must cover it, so the wording is the same whichever specification your school follows.
Tier
Both tiers. This statement is Foundation content, which means Higher students are examined on it too — Higher is Foundation plus more, never instead of it.
Calculator
This turns up on both the non-calculator and the calculator papers, so practise it both ways — the written method for Paper 1 and the efficient calculator route for Papers 2 and 3.
Common mistakes
- Mixing units inside one calculation — adding a length in centimetres to one in metres without converting.
- Converting area or volume units by the linear factor: 1 m² is 10 000 cm², not 100 cm².
- Writing 1 hour 30 minutes as 1.30 hours in a speed calculation instead of 1.5 hours.
Sample questions (10 of 30)
Nearby statements
Questions people ask
Is standard and compound units on Foundation or Higher?
Both. It is Foundation content, so it can be asked on either tier.
Can I use a calculator for standard and compound units?
It depends on the paper. Paper 1 is non-calculator; Papers 2 and 3 allow one, and this topic is asked on both kinds.
What is the single most common mistake here?
Mixing units inside one calculation — adding a length in centimetres to one in metres without converting.
Are these past paper questions?
No. Every question is original, written to this DfE content statement and checked before publication. We do not host past papers or mark schemes.
Back to Number at Foundation or at Higher.