MA14-01 Maths Watch
Function Machines: Inputs, Outputs and Reversing
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In this lesson
In this video you'll learn about function machines for GCSE Maths, with worked examples and the mistakes examiners report. By the end you'll be able to reverse a two-step function machine to find an unknown input, by inverting both the operations and their order.
What it covers
- 0:53 Function machines: the machine, forwards
- 2:31 Reversing
- 5:37 Exam technique
- 8:55 What's next
Key words
For: AQA GCSE 8300, Edexcel GCSE 1MA1, Eduqas GCSE C300, OCR GCSE J560
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | A7 | Where appropriate, interpret simple expressions as functions with inputs and outputs |
| Edexcel GCSE 1MA1 | A7 | Where appropriate, interpret simple expressions as functions with inputs and outputs. |
| Eduqas GCSE C300 | FA7 | Where appropriate, interpret simple expressions as functions with inputs and outputs |
| Eduqas GCSE C300 | HA7 | Where appropriate, interpret simple expressions as functions with inputs and outputs; interpret the reverse process as the 'inverse function'; interpret the succession of two functions as a 'composite function' |
| OCR GCSE J560 | 6.05a | Interpret, where appropriate, simple expressions as functions with inputs and outputs. |
For teachers
This GCSE Maths lesson teaches function machines: inputs, outputs and reversing. By the end, students should be able to reverse a two-step function machine to find an unknown input, by inverting both the operations and their order. It works through two worked examples and the mistakes examiners report.