Increasing a number by a percentage

Difficulty Standard · Set o9g7db

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

1
A number is 380. Increase it by 5%.
2
A number is 380. Increase it by 15%.
3
A number is 420. Increase it by 10%.
4
A number is 200. Increase it by 12%.
5
A number is 100. Increase it by 20%.
6
A number is 380. Increase it by 12%.
7
A number is 260. Increase it by 25%.
8
A number is 100. Increase it by 12%.
9
A number is 580. Increase it by 25%.
10
A number is 480. Increase it by 15%.
11
A number is 80. Increase it by 20%.
12
A number is 580. Increase it by 5%.
13
A number is 40. Increase it by 10%.
14
A number is 320. Increase it by 25%.
15
A number is 420. Increase it by 15%.
16
A number is 120. Increase it by 15%.
17
A number is 80. Increase it by 12%.
18
A number is 360. Increase it by 12%.
19
A number is 460. Increase it by 25%.
20
A number is 520. Increase it by 30%.

What is in this set

The numbers in this set run from 5 to 600.
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 140.
Answers are a whole number.

Drawing 240 problems from this page produced 152 different ones, 63% — so a sheet of 20 is a new sheet almost every time.

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.