GCSE Number

Indices

Learn indices as part of secure calculation, number properties, fractions, percentages, powers, roots and standard-form skills.

Key idea

Choose a representation first, then calculate carefully and check whether the answer is reasonable.

What you will learn

Use indices meaning confidently.

Use indices representations confidently.

Use indices methods confidently.

Use indices applications confidently.

✓I can explain what indices means.

✓I can choose a suitable method without being told.

✓I can show clear working and check my answer.

Worked example

Model method

Step 1

Find a common factor of 18 and 24.

Step 2

Both numbers divide by 6.

Step 3

1824 = 34.

Answer

Question 1

Simplify 1525.

Question 2

Round 3.746 to 2 decimal places.

Question 3

Write 4,800 in standard form.

These are linked to the wider Number topic for now.

GCSE explanations, worked examples and practice for Fractions, covering Fractions meaning, Fractions representations, Fractions methods.

A compact Number summary with key facts, methods, reminders and common mistakes.

GCSE exam-style Number questions with mixed practice, marks-style prompts and model answers.