Increasing a number by a percentage

Difficulty Starter · Set zu4c1l

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
A number is 60. Increase it by 20%.
2
A number is 40. Increase it by 20%.
3
A number is 200. Increase it by 12%.
4
A number is 180. Increase it by 30%.
5
A number is 120. Increase it by 40%.
6
A number is 140. Increase it by 10%.
7
A number is 40. Increase it by 10%.
8
A number is 180. Increase it by 25%.
9
A number is 100. Increase it by 5%.
10
A number is 120. Increase it by 30%.
11
A number is 140. Increase it by 20%.
12
A number is 180. Increase it by 30%.
13
A number is 200. Increase it by 15%.
14
A number is 160. Increase it by 5%.
15
A number is 120. Increase it by 20%.
16
A number is 40. Increase it by 15%.
17
A number is 60. Increase it by 5%.
18
A number is 80. Increase it by 10%.
19
A number is 80. Increase it by 5%.
20
A number is 120. Increase it by 12%.

What is in this set

The numbers in this set run from 5 to 200.
Every problem in it will go up.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: that is the amount added, not the total — it still has to be added to 160.
Answers are a whole number.

Drawing 240 problems from this page produced 69 different ones, 29% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

The same skill, harder or easier

We would put this in front of a grade 7 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.