Adding a percentage to a bill

Difficulty Starter · Set n0myp6

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

1
A bill of 100 has 20% added. What is the total?
2
A bill of 140 has 25% added. What is the total?
3
A bill of 180 has 15% added. What is the total?
4
A bill of 60 has 40% added. What is the total?
5
A bill of 80 has 12% added. What is the total?
6
A bill of 40 has 15% added. What is the total?
7
A bill of 200 has 20% added. What is the total?
8
A bill of 120 has 40% added. What is the total?
9
A bill of 100 has 20% added. What is the total?
10
A bill of 80 has 15% added. What is the total?
11
A bill of 100 has 12% added. What is the total?
12
A bill of 180 has 5% added. What is the total?
13
A bill of 140 has 25% added. What is the total?
14
A bill of 80 has 30% added. What is the total?
15
A bill of 60 has 10% added. What is the total?
16
A bill of 160 has 20% added. What is the total?
17
A bill of 160 has 10% added. What is the total?
18
A bill of 60 has 30% added. What is the total?
19
A bill of 120 has 40% added. What is the total?
20
A bill of 180 has 20% added. What is the total?

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 180.
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.