Taking out a common factor

Difficulty Standard · Set w8vehn

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1
Take out the greatest common factor of54x+42— what is it?
2
Take out the greatest common factor of6x+27— what is it?
3
Take out the greatest common factor of48x+42— what is it?
4
Take out the greatest common factor of14x+4— what is it?
5
Take out the greatest common factor of36x+8— what is it?
6
Take out the greatest common factor of32x+12— what is it?
7
Take out the greatest common factor of63x+49— what is it?
8
Take out the greatest common factor of42x+36— what is it?
9
Take out the greatest common factor of20x+28— what is it?
10
Take out the greatest common factor of24x+16— what is it?
11
Take out the greatest common factor of18x+14— what is it?
12
Take out the greatest common factor of21x+15— what is it?
13
Take out the greatest common factor of9x+15— what is it?
14
Take out the greatest common factor of40x+45— what is it?
15
Take out the greatest common factor of48x+56— what is it?
16
Take out the greatest common factor of24x+54— what is it?
17
Take out the greatest common factor of48x+42— what is it?
18
Take out the greatest common factor of15x+6— what is it?
19
Take out the greatest common factor of16x+28— what is it?
20
Take out the greatest common factor of24x+56— what is it?

What is in this set

The numbers in this set run from 4 to 81.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: 20 does not divide 28.
Answers are a whole number.

Drawing 240 problems from this page produced 167 different ones, 70% — 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 8 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.