Adding a percentage to a bill

Difficulty Stretch · Set 78p6m8

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

1
A bill of 1200 has 5% added. What is the total?
2
A bill of 80 has 10% added. What is the total?
3
A bill of 180 has 15% added. What is the total?
4
A bill of 720 has 10% added. What is the total?
5
A bill of 940 has 40% added. What is the total?
6
A bill of 1140 has 20% added. What is the total?
7
A bill of 500 has 10% added. What is the total?
8
A bill of 500 has 40% added. What is the total?
9
A bill of 440 has 15% added. What is the total?
10
A bill of 620 has 20% added. What is the total?
11
A bill of 280 has 10% added. What is the total?
12
A bill of 980 has 30% added. What is the total?
13
A bill of 1120 has 15% added. What is the total?
14
A bill of 180 has 25% added. What is the total?
15
A bill of 440 has 40% added. What is the total?
16
A bill of 700 has 5% added. What is the total?
17
A bill of 180 has 40% added. What is the total?
18
A bill of 600 has 20% added. What is the total?
19
A bill of 340 has 40% added. What is the total?
20
A bill of 1200 has 5% added. What is the total?

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 80.
Answers are a whole number.

Drawing 240 problems from this page produced 187 different ones, 78% — 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.