Working out change from a note

Difficulty Stretch · Set y1sgyf

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

1
Something costs $2.34 and is paid for with a $10 bill. How much change is there, in dollars?
2
Something costs $41.05 and is paid for with a $50 bill. How much change is there, in dollars?
3
Something costs $24.90 and is paid for with a $50 bill. How much change is there, in dollars?
4
Something costs $1.78 and is paid for with a $10 bill. How much change is there, in dollars?
5
Something costs $15.36 and is paid for with a $20 bill. How much change is there, in dollars?
6
Something costs $10.49 and is paid for with a $20 bill. How much change is there, in dollars?
7
Something costs $19.09 and is paid for with a $20 bill. How much change is there, in dollars?
8
Something costs $13.06 and is paid for with a $50 bill. How much change is there, in dollars?
9
Something costs $1.89 and is paid for with a $10 bill. How much change is there, in dollars?
10
Something costs $17.07 and is paid for with a $20 bill. How much change is there, in dollars?
11
Something costs $9.91 and is paid for with a $20 bill. How much change is there, in dollars?
12
Something costs $4.82 and is paid for with a $10 bill. How much change is there, in dollars?
13
Something costs $4.74 and is paid for with a $20 bill. How much change is there, in dollars?
14
Something costs $4.35 and is paid for with a $50 bill. How much change is there, in dollars?
15
Something costs $12.69 and is paid for with a $20 bill. How much change is there, in dollars?
16
Something costs $36.22 and is paid for with a $50 bill. How much change is there, in dollars?
17
Something costs $31.83 and is paid for with a $50 bill. How much change is there, in dollars?
18
Something costs $3.72 and is paid for with a $20 bill. How much change is there, in dollars?
19
Something costs $17.51 and is paid for with a $20 bill. How much change is there, in dollars?
20
Something costs $4.85 and is paid for with a $20 bill. How much change is there, in dollars?

What is in this set

The numbers in this set run from 1.04 to 50.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the price was added to the bill; change is what is left after the price is taken away.
Answers are an amount with two decimal places.

Drawing 240 problems from this page produced 233 different ones, 97% — 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 4 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.