Taking out a common factor

Difficulty Stretch · Set x5ux93

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1
Take out the greatest common factor of20x+22— what is it?
2
Take out the greatest common factor of10x+15— what is it?
3
Take out the greatest common factor of40x+112— what is it?
4
Take out the greatest common factor of84x+156— what is it?
5
Take out the greatest common factor of49x+56— what is it?
6
Take out the greatest common factor of28x+48— what is it?
7
Take out the greatest common factor of56x+52— what is it?
8
Take out the greatest common factor of70x+126— what is it?
9
Take out the greatest common factor of27x+63— what is it?
10
Take out the greatest common factor of36x+168— what is it?
11
Take out the greatest common factor of42x+154— what is it?
12
Take out the greatest common factor of36x+81— what is it?
13
Take out the greatest common factor of96x+156— what is it?
14
Take out the greatest common factor of18x+26— what is it?
15
Take out the greatest common factor of84x+18— what is it?
16
Take out the greatest common factor of96x+132— what is it?
17
Take out the greatest common factor of28x+20— what is it?
18
Take out the greatest common factor of132x+84— what is it?
19
Take out the greatest common factor of40x+96— what is it?
20
Take out the greatest common factor of26x+143— what is it?

What is in this set

The numbers in this set run from 4 to 196.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: 70 does not divide 15.
Answers are a whole number.

Drawing 240 problems from this page produced 219 different ones, 91% — 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.