Numeracy Skill- A Quick Guide to Simple Calcuations

Working with Percentage Change

Percentage Increase:

Percentage Increase = Difference between the two numbers compared  divided by the Original number and then multiply by 100

% Increase = (New Number- Original Number) / Original Number x 100

Percentage Decrease = Difference between the two numbers (decrease) compared  divided by the Original number and then multiply by 100

% Decrease = (Original Number – New Number) / Original Number x 100

 

Averages: Mean, Median and Mode

Mean

Add all the values and then divide with the number of numbers

Mean = Sum of values / Number of values

Median

Arrange all the number in order and determine the middle number. That number is your median

Median = Middle number when all the numbers are ranked

Mode

Count how many times each value appears in a set of numbers. The most frequent number is your mode.

Mode = The most frequently occurring value.

 

BODMAS

A very important rule while performing calculations or solving mathematical problems. Always follow this order while solving mathematical problems.

The BODMAS acronym is for:

• Brackets (parts of a calculation inside brackets always come first -left to right)
• Orders (numbers involving powers or square roots)
• Division
• Multiplication
• Addition
• Subtraction