Increasing a quantity makes it bigger. Decreasing a quantity makes it smaller.
Example:
Increase the number 40 by 25%.
100% = 40
An increase means 100% + 25% = 125%
= (125/100) x 40 = 50
Decrease 40 by 25%.
A decrease means 100% – 25% = 75%
=(75/100) x 40 = 30
Exercises
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Question 1 of 7
1. Question
Increase 60 by 30%.

Working:
100% = 60
Increase by 30% = % + % = %
%=
x
100 1 Answer =
CorrectIncorrect 

Question 2 of 7
2. Question
Decrease 75 by 20%.

Working:
100% = 75
Decrease by 20% = % – % = %
%=
x
100 1 Answer =
Correct 7 / 7 PointsIncorrect / 7 Points 

Question 3 of 7
3. Question
Increase $37.25 by 15%
Give your final answer as a whole number.

Working:
100% = 37.25
Increase by 15% = % + % = %
%=
x
100 1 Answer =
CorrectIncorrect 

Question 4 of 7
4. Question
Increase 1 km by 46%.

Working:
100% = 1 km
Increase by 46% = % + % = %
%=
x
100 1 Answer = km
CorrectIncorrect 

Question 5 of 7
5. Question
Decrease 139 grams by 42%.

Working:
100% = 139 g
Decrease by 42% = % + % = %
%=
x
1 Answer = g
Correct 8 / 8 PointsIncorrect / 8 Points 

Question 6 of 7
6. Question
Decrease 456.20 by 50%

Working:
100% = 456.20
Decrease by 50% = % – % = %
%=
x
1 This is the same as: x 456.2 =
This is the same as: 456.20 ÷ =
Answer =
Correct 10 / 10 PointsIncorrect / 10 Points 

Question 7 of 7
7. Question
Decrease 400 by 25%.

Working:
100% =
Decrease by 25% = % – % = %
%=
x
1 Answer =
Correct 9 / 9 PointsIncorrect / 9 Points 