IGCSE Maths / Powers and roots
Standard form arithmetic revision notes
Edexcel International GCSE Maths (4MA1), chapter 3: Powers and roots, specification point 1.9a. Part of the full course.
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Standard form writes very large or very small numbers as a front number multiplied by a power of 10. You need to be able to convert numbers, multiply and divide them, and make sure each final answer is in standard form.