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Using Simple Formulae (2)

In this worksheet, students use simple formulae to answer questions. Symbols are used.

'Using Simple Formulae (2)' worksheet

Key stage:  KS 2

Curriculum topic:   Algebra

Curriculum subtopic:   Use Algebra Formulae

Difficulty level:  

Worksheet Overview

A formula tells you how to work something out based on what you know already.

 

If you know the length of the side of a square, how would you work out its perimeter?

The answer is to multiply it by 4, because a square has 4 sides of equal length.

 

We can use a formula to state this, but first we must say what the letters stand for.

s = side length of square

P = perimeter of square

 

The formula will be

P = 4s

which means P = 4 × s.

 

If s = 5,

P = 4 × 5 = 20.

 

If s = 15,

P = 4 × 15 = 60.

 

 

Example

Mum uses the following formula to work out our pocket money.

P = A × 30 ÷ 2 + 100

where P stands for pocket money in pence and A stands for our age in years.

 

Bill is 5 years old. How much does he get?

Amy is 15 years old. How much does she get?

 

Answer

Bill

A = 5

P = 5 × 30 ÷ 2 + 100 = 150 ÷ 2 + 100 = 75 + 100 = 175 pence

 

Amy

A = 15

P = 15 × 30 ÷ 2 + 100 = 450 ÷ 2 + 100 = 225 + 100 = 325 pence

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