MA01-04 Maths Watch
Adding, subtracting, multiplying and dividing decimals
Subscribe on YouTubeLike this lesson on YouTube
In this lesson
In this video you'll learn about adding, subtracting, multiplying and dividing decimals for GCSE Maths, with worked examples and the mistakes examiners report. By the end you'll be able to add, subtract, multiply and divide decimals using a formal written method, keeping the decimal point correctly aligned throughout.
What it covers
- 0:46 Columns are the whole game
- 2:38 Here is her sum again, set up properly, one column at a time
- 4:20 Money is kind to you here, and it is worth knowing why
- 6:12 Multiplying changes the rule
- 8:14 One operation left
- 9:47 The writing side, and how the working should look on the page
- 10:59 Everything you need for these two is already on the page
- 13:18 What's next
Key words
For: AQA GCSE 8300, Edexcel GCSE 1MA1, Edexcel IGCSE 4MA1, Eduqas GCSE C300, Cambridge IGCSE 0580, OCR GCSE J560
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | N2 | Apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative |
| Edexcel GCSE 1MA1 | N2 | Apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative; understand and use place value (e.g. when working with very large or very small numbers, and when calculating with decimals) |
| Edexcel IGCSE 4MA1 | F1.1E | Use the four rules of addition, subtraction, multiplication and division |
| Eduqas GCSE C300 | FN2 | Apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative; understand and use place value (e.g. when working with very large or very small numbers, and when calculating with decimals) |
| Eduqas GCSE C300 | HN2 | Apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative; understand and use place value (e.g. when working with very large or very small numbers, and when calculating with decimals) |
| Cambridge IGCSE 0580 | C1.6 | Use the four operations for calculations with integers, fractions and decimals, including correct ordering of operations and use of brackets. |
| Cambridge IGCSE 0580 | E1.6 | Use the four operations for calculations with integers, fractions and decimals, including correct ordering of operations and use of brackets. |
| OCR GCSE J560 | 1.01a | Use non-calculator methods to calculate the sum, difference, product and quotient of positive and negative whole numbers. |
| OCR GCSE J560 | 2.01b | Add, subtract, multiply and divide simple fractions (proper and improper), including mixed numbers and negative fractions. |
| OCR GCSE J560 | 2.02b | Add, subtract and multiply decimals including negative decimals, without a calculator. |
| OCR GCSE J560 | 2.02c | Divide a decimal by a whole number, including negative decimals, without a calculator. |
For teachers
This GCSE Maths lesson teaches adding, subtracting, multiplying and dividing decimals. By the end, students should be able to add, subtract, multiply and divide decimals using a formal written method, keeping the decimal point correctly aligned throughout. It works through three worked examples and the mistakes examiners report.