Perimeter of a triangle

Difficulty Starter · Set 8rtsfm

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

What is in this set

The numbers in this set run from 1 to 16.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: only two sides were added; a triangle has three of them.
Answers are a whole number.

Drawing 240 problems from this page produced 216 different ones, 90% — 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 4 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.