# Expressing missing numbers algebraically

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## Lesson details

### Key learning points

- In this lesson, we will be finding the unknown values in algebraic expressions.

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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.

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### 4 Questions

Q1.

What would be the next term in this sequence? 4.5, 4.75, 5, 5.25, 5.5, 5.75

5.5

6.25

6.5

Q2.

What is the term to term rule in this sequence? 9.2, 9.15, 9.1, 9.05

- 0.5

+ 0.05

+ 0.5

Q3.

What would be the previous term in this sequence? -3, -1, 1, 3, 5

-4

6

7

Q4.

Look at the following sequence, which term below can not be part of that sequence? 56, 61, 66, 71, 76

1001

1006

1016

### 5 Questions

Q1.

t + 7 = 20 What is the value of t?

t = 10

t = 12

t = 27

Q2.

If 5a = 35 What is the value of a?

30

40

6

Q3.

How could we express the perimeter of the rectangle below?

4a

a + b

ab

Q4.

How could we express the perimeter of the square below?

2r

r + 4

r + s

Q5.

If 2f + 6= 20. What is the value of f?

6

8

9