Perimeter of a square

Difficulty Starter · Set uem75t

The drawings are schematic: work from the lengths marked on them, not from their proportions.

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

1
What is the perimeter, in cm?
2
What is the perimeter, in m?
3
What is the perimeter, in mm?
4
What is the perimeter, in cm?
5
What is the perimeter, in cm?
6
What is the perimeter, in mm?
7
What is the perimeter, in m?
8
What is the perimeter, in m?
9
What is the perimeter, in m?
10
What is the perimeter, in cm?
11
What is the perimeter, in cm?
12
What is the perimeter, in m?
13
What is the perimeter, in m?
14
What is the perimeter, in m?
15
What is the perimeter, in mm?
16
What is the perimeter, in m?
17
What is the perimeter, in m?
18
What is the perimeter, in m?
19
What is the perimeter, in m?
20
What is the perimeter, in m?

What is in this set

The numbers in this set run from 3 to 9.
Every problem in it will are a square number.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 86% of the problems: the sides were multiplied — that is the area; the perimeter is the distance all the way round.
Answers are a whole number.

Drawing 240 problems from this page produced 21 different ones, 9% — 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 3 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.