# Maths GCSE cards

• Created by: Ola__
• Created on: 13-08-18 22:26

## BODMAS

The sequence of doing operations in a mathematic formula can be remembered by BODMAS :

B - Brackets

O - Other  (example squaring or cubing or square root

D - Division

M - Multiplication

S - Subtraction

Remember :

• Minus and Minus equals Plus
• Minus and Plus equals Minus
• Plus and Minus equals Minus
• Plus and Plus equals Plus
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## Calcultions using percentages

Finding a percentage :

Find X % of Y     e.g. Find 15% of £46.00

Method a:

• convert the percentage you want into a fraction
• then multiply it by the amount you want  the percentage from
• so 15/100 of £46.00 = 15/100 * 46 = £6.90
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## Lowest Common Multiple

The smallest number that will divide by all the numbers in question

e.g. the LCM of 3 and 5

• multiples of 3 are - 3, 6, 9, 12, 15, 18, 21
• multiples of 5 are - 5, 10, 15, 20, 21, 25, 30

The smallest number that 3 and 5 will both go into is 15. This is the LCM

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## Highest Common Factor

The biggest number that will divide into all the numbers in question

e.g. the HCF of 8 and 12

• the factors of 8 are - 1, 2, 4, 8
• the factors of 12 are - 1, 2, 3, 4, 6, 12

The highest number that will divide into both 8 and 12 is 4. This is the HCM

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