Surface area of a cuboid

Difficulty Stretch · Set gn25sk

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1
A box measures 2 by 15 by 10 m. What is its surface area, in square m?
2
A box measures 13 by 22 by 8 mm. What is its surface area, in square mm?
3
A box measures 25 by 4 by 12 m. What is its surface area, in square m?
4
A box measures 6 by 15 by 7 m. What is its surface area, in square m?
5
A box measures 15 by 4 by 17 mm. What is its surface area, in square mm?
6
A box measures 17 by 6 by 19 cm. What is its surface area, in square cm?
7
A box measures 5 by 10 by 14 m. What is its surface area, in square m?
8
A box measures 6 by 21 by 14 cm. What is its surface area, in square cm?
9
A box measures 13 by 14 by 11 m. What is its surface area, in square m?
10
A box measures 19 by 9 by 12 m. What is its surface area, in square m?
11
A box measures 5 by 25 by 11 cm. What is its surface area, in square cm?
12
A box measures 20 by 20 by 25 m. What is its surface area, in square m?
13
A box measures 23 by 5 by 25 cm. What is its surface area, in square cm?
14
A box measures 5 by 24 by 7 cm. What is its surface area, in square cm?
15
A box measures 2 by 13 by 24 mm. What is its surface area, in square mm?
16
A box measures 4 by 19 by 5 m. What is its surface area, in square m?
17
A box measures 4 by 10 by 23 cm. What is its surface area, in square cm?
18
A box measures 25 by 25 by 18 m. What is its surface area, in square m?
19
A box measures 17 by 24 by 21 cm. What is its surface area, in square cm?
20
A box measures 9 by 22 by 13 mm. What is its surface area, in square mm?

What is in this set

The numbers in this set run from 2 to 25.
A careful solution takes 4 written steps on average.
The mistake this set invites most often, in 100% 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 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.