Fill in what you can and press Check. Nothing you type is sent anywhere.
1
911−711=
2
35−25=
3
811−311=
4
12−12=
5
34−14=
6
25−310=
7
67−37=
8
47−17=
9
34−12=
10
57−47=
11
12−38=
12
611−411=
13
23−13=
14
12−38=
15
1011−211=
16
12−12=
17
34−18=
18
23−13=
19
811−511=
20
12−12=
Answer key
What is in this set
The numbers in this set run from 1 to 12.
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 80% 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 97 different ones, 40% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.
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.