Collecting like terms

Difficulty Stretch · Set ubkdpk

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1
Simplify13x+12−12x+12— give the number of x.
2
Simplify7x+15−4x+8— give the number of x.
3
Simplify11x+11−11x+8— give the number of x.
4
Simplify8x+17−7x+8— give the number of x.
5
Simplify2x+6−9x+9— give the number of x.
6
Simplify8x+10−11x+6— give the number of x.
7
Simplify2x+17−7x+8— give the number of x.
8
Simplify12x+10−6x+13— give the number of x.
9
Simplify11x+14−12x+9— give the number of x.
10
Simplify5x+3−13x+8— give the number of x.
11
Simplify6x+13−3x+7— give the number of x.
12
Simplify7x+16−13x+5— give the number of x.
13
Simplify3x+8−6x+3— give the number of x.
14
Simplify2x+16−8x+2— give the number of x.
15
Simplify14x+9−3x+8— give the number of x.
16
Simplify6x+2−3x+9— give the number of x.
17
Simplify2x+7−4x+11— give the number of x.
18
Simplify11x+2−11x+10— give the number of x.
19
Simplify9x+14−3x+3— give the number of x.
20
Simplify5x+3−8x+5— give the number of x.

What is in this set

The numbers in this set run from 2 to 17.
44% of them leave a negative number of x.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 100% of the problems: the minus in front of the second x term was dropped when the terms were collected.
Answers are a whole number.

Drawing 240 problems from this page produced 240 different ones, 100% — 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 7 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.