Surface area of a cube

Difficulty Stretch · Set ht0je7

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

1
A cube has sides of 21 m. What is its surface area, in square m?
2
A cube has sides of 17 mm. What is its surface area, in square mm?
3
A cube has sides of 12 mm. What is its surface area, in square mm?
4
A cube has sides of 20 cm. What is its surface area, in square cm?
5
A cube has sides of 17 cm. What is its surface area, in square cm?
6
A cube has sides of 17 m. What is its surface area, in square m?
7
A cube has sides of 25 cm. What is its surface area, in square cm?
8
A cube has sides of 8 m. What is its surface area, in square m?
9
A cube has sides of 20 mm. What is its surface area, in square mm?
10
A cube has sides of 12 cm. What is its surface area, in square cm?
11
A cube has sides of 12 mm. What is its surface area, in square mm?
12
A cube has sides of 20 m. What is its surface area, in square m?
13
A cube has sides of 20 mm. What is its surface area, in square mm?
14
A cube has sides of 14 mm. What is its surface area, in square mm?
15
A cube has sides of 7 mm. What is its surface area, in square mm?
16
A cube has sides of 15 m. What is its surface area, in square m?
17
A cube has sides of 23 m. What is its surface area, in square m?
18
A cube has sides of 4 cm. What is its surface area, in square cm?
19
A cube has sides of 7 mm. What is its surface area, in square mm?
20
A cube has sides of 19 m. What is its surface area, in square m?

What is in this set

The numbers in this set run from 2 to 25.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 95% of the problems: the three lengths were multiplied — that is the volume; a surface area adds up the faces.
Answers are a whole number.

Drawing 240 problems from this page produced 70 different ones, 29% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

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.