  # Use Simple Formulae

In this worksheet, students will be asked to use simple algebraic formula to solve different mathematical problems. Key stage:  KS 2

Curriculum topic:   Algebra

Curriculum subtopic:   Use Algebra Formulae

Popular topics:   Algebra worksheets

Difficulty level:   #### Worksheet Overview

Sometimes in Maths numbers can be replaced by letters but do not be put off by letters!

Letters are used for a special type of Maths, called algebra.

When we use algebra, we use 'formula'.

Formula is a concise, simple way of showing information with symbols.

There are lots of formulas in Maths to find.

For example: area, perimeter and circumference.

Example 1:

If a = 6, b = 3 and c = 7, calculate the value of:

1. a + b =             2. a - b =            3. c + b - a =

Solution:

1. a + b

= 6 + 3 = 9

2. a - b

= 6 - 3 = 3

3. c + b - a

= 7 + 3 - 6 = 4

Reminders:

There are some rules to remember when using formula:

We write:

2 x a as 2a

a x b = ab

a ÷ b as a/b

Example 2:

If p = 6, q = 12, r = 4 and s = 3 calculate the value of:

1. rs           2. 2r + 3s            3. s/3

Solution:

1. rs = r x s

= 4 x 3 = 12

2. 2r + 3s  = 2 x r + 3 x s

= 2 x 4 + 3 x 3

=8 + 9 = 17

3. s/3 = 3 / 3

= 1

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