Fill in what you can and press Check. Nothing you type is sent anywhere.
1
34−18=
2
78−316=
3
1619−119=
4
1617−417=
5
23−13=
6
79−59=
7
57−27=
8
1314−514=
9
45−25=
10
12−12=
11
1415−715=
12
519−319=
13
1920−920=
14
12−12=
15
58−12=
16
25−15=
17
34−14=
18
45−25=
19
13−115=
20
1217−1017=
Answer key
What is in this set
The numbers in this set run from 1 to 20.
Every problem in it will share a denominator.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 85% of the problems: the tops were combined and the bottoms were combined; the denominator names the size of the part and never changes when parts are counted.
Answers are a fraction in its lowest terms, written like 3/4.
Drawing 240 problems from this page produced 162 different ones, 68% — so a sheet of 20 is a new sheet almost every time.
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.