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GCSE Physics units and standard form

Convert metric prefixes, grams and squared or cubed units; write numbers in standard form.

Practise

Between prefixes

Express 5.5 km in Mm.

Use decimals or e notation, e.g. 4.2e-3. Enter the unit separately.

Hint

One km is 10-3 Mm. A smaller unit gives a larger numerical value for the same quantity.

Worked solution
  1. 1 km = 10-3 Mm.
  2. 5.5 km = 5.5 × 10-3 Mm = 5.5 × 10-3 Mm.
Another question
Question type: Mixed practice
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Foundation and Higher: this set covers content common to both tiers. Some calculations need several steps.

Units and powers

This set uses nano, micro, milli, centi, kilo and mega. A prefix on a squared or cubed length applies to every length factor: 1 cm³ = (0.01 m)³. The SI base unit for mass is kg. Standard form has a coefficient from 1 inclusive to 10 exclusive.

GCSE scope

AQA 8463: MS 1a–b, 3c, 5c; 4.2.1.3; OCR Gateway J249: 5e Units; 5g M1a–b, M3c, M5c; P3.2. Tasks cover the selected skills listed above.

AQA specification · OCR Gateway specification

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