Percentage - Change, increase, reverse

Question 1

How do you calculate percentage change?

Answer 1

Change
——————– x 100
Original value

Question 2

How do you find the decimal multipliers for an increase?

Answer 2

Add the percentage to 100 then divide 100

1 . the percentage

Question 3

How do you find the decimal multipliers for a decrease?

Answer 3

Take the percentage away from 100 then place 0 and a decimal

Question 4

100% as a decimal multiplier?

Answer 4

TImes by 1

Question 5

80% as a decimal multiplier?

Answer 5

0.8

Question 6

Method 1 for working out the value before a percentage change:

The original price of a television is released by 30% in a sale. The sale price of the television is £350. Work out the normal price of the TV.

Answer 6

x = Value before percentage change

x X 0.7 = £350
x = 350/0.7 = £500

Question 7

Where did I get the 0.7?

Answer 7

It’s what is left from 100 percentage

70% as a decimal multiplier

Question 8

Method 2 for working out the value before a percentage change:

The original price of a television is released by 30% in a sale. The sale price of the television is £350. Work out the normal price of the TV.

Answer 8

70% = £350
You have 70% try and get 10% to find 100%
10% = £50
100% = £500