Putting a number into an expression

Difficulty Starter · Set 2e52yl

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1
If x = 9, work out5x+6=
2
If x = 6, work out5x+11=
3
If x = 7, work out5x+2=
4
If x = 4, work out2x+5=
5
If x = 2, work out5x+4=
6
If x = 4, work out3x+12=
7
If x = 2, work out3x+2=
8
If x = 5, work out2x+3=
9
If x = 6, work out4x+6=
10
If x = 7, work out4x+9=
11
If x = 6, work out4x+3=
12
If x = 7, work out2x+2=
13
If x = 9, work out3x+8=
14
If x = 5, work out6x+2=
15
If x = 8, work out5x+5=
16
If x = 4, work out4x+5=
17
If x = 7, work out2x+9=
18
If x = 9, work out3x+2=
19
If x = 9, work out2x+9=
20
If x = 5, work out5x+10=

What is in this set

The numbers in this set run from 2 to 12.
Every problem in it will substitute a positive number.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: 3x means 3 × x, so with x = 3 it is 9, not the two digits written next to each other.
Answers are a whole number.

Drawing 240 problems from this page produced 186 different ones, 78% — 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 6 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.