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1
47−18=
2
57−25=
3
78−35=
4
58−25=
5
56−57=
6
710−23=
7
910−911=
8
14−29=
9
911−25=
10
45−12=
11
57−12=
12
710−12=
13
611−12=
14
12−19=
15
45−59=
16
38−13=
17
710−12=
18
78−911=
19
23−712=
20
911−79=
Answer key
What is in this set
The numbers in this set run from 1 to 12.
Every problem in it will have unlike denominators.
25% of them need simplifying at the end.
A careful solution takes 4 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 196 different ones, 82% — so a sheet of 20 is a new sheet almost every time.
We would put this in front of a grade 5 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.