Surface area of a cuboid

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1
A box measures 11 by 2 by 10 mm. What is its surface area, in square mm?
2
A box measures 12 by 3 by 2 mm. What is its surface area, in square mm?
3
A box measures 2 by 3 by 12 mm. What is its surface area, in square mm?
4
A box measures 11 by 10 by 8 mm. What is its surface area, in square mm?
5
A box measures 4 by 12 by 10 cm. What is its surface area, in square cm?
6
A box measures 6 by 4 by 12 cm. What is its surface area, in square cm?
7
A box measures 2 by 5 by 11 m. What is its surface area, in square m?
8
A box measures 11 by 4 by 10 m. What is its surface area, in square m?
9
A box measures 6 by 10 by 8 cm. What is its surface area, in square cm?
10
A box measures 10 by 2 by 11 m. What is its surface area, in square m?
11
A box measures 8 by 2 by 2 cm. What is its surface area, in square cm?
12
A box measures 6 by 7 by 2 m. What is its surface area, in square m?
13
A box measures 3 by 6 by 5 cm. What is its surface area, in square cm?
14
A box measures 3 by 4 by 12 m. What is its surface area, in square m?
15
A box measures 2 by 9 by 12 m. What is its surface area, in square m?
16
A box measures 8 by 7 by 7 cm. What is its surface area, in square cm?
17
A box measures 5 by 9 by 12 mm. What is its surface area, in square mm?
18
A box measures 9 by 6 by 9 cm. What is its surface area, in square cm?
19
A box measures 12 by 7 by 2 mm. What is its surface area, in square mm?
20
A box measures 10 by 3 by 4 cm. What is its surface area, in square cm?

What is in this set

The numbers in this set run from 2 to 12.
A careful solution takes 4 written steps on average.
The mistake this set invites most often, in 98% of the problems: the three lengths were multiplied — that is the volume; the surface area adds up the six faces.
Answers are a whole number.

Drawing 240 problems from this page produced 236 different ones, 98% — 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.