Proportion, ratio and percentages

Question 1

How do you work out percentage of an amount?

Answer 1

Amount x % (changed to decimal) x 100

Question 2

How do you work out percentage increase?

Answer 2

Get the amount and multiply it by 1 + whatever the percentage is e.g. 50% increase would be x 1.5

Question 3

How do you work out percentage decrease?

Answer 3

Get the amount and multiply it by 1 - whatever the percentage is e.g. 5% decrease would be x 0.95

Question 4

How do you work out ratio of amounts?

Answer 4

Add the numbers up divide the amount by the sum of the numbers then multiply the result by the starting numbers

Question 5

What do you do to work out compound interest?

Answer 5

Starting amount multiplied by the interest percentage to the power of how many years it is

Question 6

What’s simple interest?

Answer 6

Where you get the starting amount and times it by the percentage but instead of multiplying to the power of years you have to multiply it by the starting amount each time and add it up