NumberKey Facts

What is Standard Form?

Part of Standard Form — GCSE Mathematics

This key facts covers What is Standard Form? within Standard Form for GCSE Mathematics. Revise Standard Form in Number for GCSE Mathematics with 14 exam-style questions and 22 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 14 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 2 of 14

Practice

14 questions

Recall

22 flashcards

What is Standard Form?

Definition: A number written as a × 10ⁿ
Rule for 'a': Must be 1 ≤ a < 10 (at least 1, less than 10)
Power 'n': Positive for large numbers, negative for small
Purpose: Makes very large/small numbers manageable
Also called: Scientific notation or exponential form

Keep building this topic

Read this section alongside the surrounding pages in Standard Form. That gives you the full topic sequence instead of a single isolated revision point.

Numbers Beyond Imagination Standard Form Rules Method: Converting TO Standard Form Method: Converting FROM Standard Form

Practice Questions for Standard Form

Which of these numbers is written in standard form?

A. 45 × 10³
B. 4.5 × 10⁴
C. 0.45 × 10⁵
D. 450 × 10²

1 markfoundation

Explain why standard form is useful for writing very large or very small numbers.

2 markshigher

Quick Recall Flashcards

Converting TO Standard Form

1. Move decimal to make 1 ≤ a < 10 2. Count places moved 3. Large (left) → positive power 4. Small (right) → negative power 780,000 → 7.8 × 10⁵

What is Standard Form?

A number written as a × 10ⁿ Where: • 1 ≤ a < 10 (at least 1, less than 10) • n is an integer (whole number) Example: 3.5 × 10⁴

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Numbers Beyond Imagination

Standard Form Rules