# Equations and identities

## Lesson details

### Key learning points

1. In this lesson, we will look at the difference between an equation and an identity.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
Which of the following are expressions?
10 = 2e
3a + 2 = 5
Q2.
What is the value of the cubes if a = 4?
12
16
8
Q3.
What is the value of this expression if a = 5?
-3
29
5
Q4.
Which expression has the greatest value when a = 7?
2a + 1
3a - 6
Correct answer: Neither - they are both equal
Q5.
Which expression has the greatest value when a = 4?
3a - 6
Neither - they are both equal

## Exit quiz

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### 8 Questions

Q1.
If a = 3, which of the following is true?
Correct answer: 3a + 4 = 5a - 2
4a + 1 = 12
6a = 3 - a
Q2.
Which description best fits an identity?
A collection of variables
Something that can always be solved to find a value
Correct answer: Something that is always true, whatever the value
Q3.
Is the following an expression, equation, or identity?
Expression
Identity
Q4.
Is the following an expression, equation, or identity?
Equation
Expression
Q5.
If x=5, which symbol should go in the box?
Q6.
If x=5, which symbol should go in the box
=