Mixed numbers to improper fractions

Difficulty Stretch · Set i3n4pz

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1
Write41415as a single fraction.
2
Write268as a single fraction.
3
Write523as a single fraction.
4
Write647as a single fraction.
5
Write2112as a single fraction.
6
Write3711as a single fraction.
7
Write517as a single fraction.
8
Write223as a single fraction.
9
Write669as a single fraction.
10
Write4616as a single fraction.
11
Write5511as a single fraction.
12
Write4213as a single fraction.
13
Write5510as a single fraction.
14
Write21116as a single fraction.
15
Write61214as a single fraction.
16
Write51012as a single fraction.
17
Write3615as a single fraction.
18
Write31213as a single fraction.
19
Write5613as a single fraction.
20
Write245as a single fraction.

What is in this set

The numbers in this set run from 1 to 16.
Every problem in it will cross between improper and mixed form.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the whole number was added to the numerator.
Answers are a fraction in its lowest terms, written like 3/4.

Drawing 240 problems from this page produced 177 different ones, 74% — 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 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.