This key facts covers Operations with Decimals within Integers & Decimals for GCSE Mathematics. Revise Integers & Decimals in Number for GCSE Mathematics with 14 exam-style questions and 22 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 3 of 12 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 3 of 12
Practice
14 questions
Recall
22 flashcards
Operations with Decimals
| Operation | Key Rule | Example | Common Error |
|---|---|---|---|
| Addition | Line up decimal points | 12.3 + 5.67 = 17.97 | Not aligning: 12.3 + 5.67 ≠ 17.10 |
| Subtraction | Line up decimal points | 15.2 - 3.45 = 11.75 | Forgetting to borrow |
| Multiplication | Count total decimal places | 2.3 × 1.5 = 3.45 | Wrong decimal position |
| Division | Move decimal to make divisor whole | 6.3 ÷ 0.7 = 63 ÷ 7 = 9 | Not moving both decimals |