Percentage - Change, increase, reverse Flashcards Preview

Maths AQA > Percentage - Change, increase, reverse > Flashcards

Flashcards in Percentage - Change, increase, reverse Deck (8)
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1
Q

How do you calculate percentage change?

A

Change
——————– x 100
Original value

2
Q

How do you find the decimal multipliers for an increase?

A

Add the percentage to 100 then divide 100

1 . the percentage

3
Q

How do you find the decimal multipliers for a decrease?

A

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

4
Q

100% as a decimal multiplier?

A

TImes by 1

5
Q

80% as a decimal multiplier?

A

0.8

6
Q

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.

A

x = Value before percentage change

x X 0.7 = £350
x = 350/0.7 = £500

7
Q

Where did I get the 0.7?

A

It’s what is left from 100 percentage

70% as a decimal multiplier

8
Q

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.

A

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