Increasing a number by a percentage

Difficulty Stretch · Set 5qi2iz

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

1
A number is 1020. Increase it by 12%.
2
A number is 1160. Increase it by 25%.
3
A number is 760. Increase it by 40%.
4
A number is 660. Increase it by 12%.
5
A number is 200. Increase it by 10%.
6
A number is 1160. Increase it by 15%.
7
A number is 520. Increase it by 5%.
8
A number is 780. Increase it by 40%.
9
A number is 740. Increase it by 10%.
10
A number is 160. Increase it by 15%.
11
A number is 240. Increase it by 40%.
12
A number is 840. Increase it by 5%.
13
A number is 240. Increase it by 12%.
14
A number is 360. Increase it by 12%.
15
A number is 300. Increase it by 20%.
16
A number is 320. Increase it by 5%.
17
A number is 940. Increase it by 40%.
18
A number is 280. Increase it by 20%.
19
A number is 160. Increase it by 15%.
20
A number is 460. Increase it by 12%.

What is in this set

The numbers in this set run from 5 to 1,200.
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 1140.
Answers are a whole number.

Drawing 240 problems from this page produced 191 different ones, 80% — 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.