Expanding a single bracket

Difficulty Standard · Set 29s41n

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
Expand3(9x+12)— give the number of x.
2
Expand8(7x+7)— give the number of x.
3
Expand5(4x+6)— give the number of x.
4
Expand2(4x+5)— give the number of x.
5
Expand2(7x+4)— give the number of x.
6
Expand5(4x+3)— give the number of x.
7
Expand7(4x+8)— give the number of x.
8
Expand7(4x+9)— give the number of x.
9
Expand3(9x+2)— give the number of x.
10
Expand2(4x+4)— give the number of x.
11
Expand9(9x+3)— give the number of x.
12
Expand9(2x+6)— give the number of x.
13
Expand6(5x+12)— give the number of x.
14
Expand9(3x+6)— give the number of x.
15
Expand3(7x+5)— give the number of x.
16
Expand8(2x+2)— give the number of x.
17
Expand9(6x+3)— give the number of x.
18
Expand3(2x+2)— give the number of x.
19
Expand8(7x+8)— give the number of x.
20
Expand6(6x+7)— give the number of x.

What is in this set

The numbers in this set run from 2 to 12.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: only the 9 was multiplied by 9.
Answers are a whole number.

Drawing 240 problems from this page produced 207 different ones, 86% — 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.