Reading a scale drawing

Difficulty Standard · Set ags9bm

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1
A plan is drawn at 1 : 25. A wall is 19 cm on the plan. How long is the wall in real life, in meters?
2
A plan is drawn at 1 : 100. A wall is 16 cm on the plan. How long is the wall in real life, in meters?
3
A plan is drawn at 1 : 25. A wall is 25 cm on the plan. How long is the wall in real life, in meters?
4
A plan is drawn at 1 : 50. A wall is 7 cm on the plan. How long is the wall in real life, in meters?
5
A plan is drawn at 1 : 20. A wall is 21 cm on the plan. How long is the wall in real life, in meters?
6
A plan is drawn at 1 : 50. A wall is 5 cm on the plan. How long is the wall in real life, in meters?
7
A plan is drawn at 1 : 50. A wall is 24 cm on the plan. How long is the wall in real life, in meters?
8
A plan is drawn at 1 : 20. A wall is 27 cm on the plan. How long is the wall in real life, in meters?
9
A plan is drawn at 1 : 20. A wall is 18 cm on the plan. How long is the wall in real life, in meters?
10
A plan is drawn at 1 : 100. A wall is 28 cm on the plan. How long is the wall in real life, in meters?
11
A plan is drawn at 1 : 25. A wall is 29 cm on the plan. How long is the wall in real life, in meters?
12
A plan is drawn at 1 : 50. A wall is 15 cm on the plan. How long is the wall in real life, in meters?
13
A plan is drawn at 1 : 25. A wall is 24 cm on the plan. How long is the wall in real life, in meters?
14
A plan is drawn at 1 : 20. A wall is 6 cm on the plan. How long is the wall in real life, in meters?
15
A plan is drawn at 1 : 20. A wall is 5 cm on the plan. How long is the wall in real life, in meters?
16
A plan is drawn at 1 : 50. A wall is 16 cm on the plan. How long is the wall in real life, in meters?
17
A plan is drawn at 1 : 20. A wall is 7 cm on the plan. How long is the wall in real life, in meters?
18
A plan is drawn at 1 : 20. A wall is 15 cm on the plan. How long is the wall in real life, in meters?
19
A plan is drawn at 1 : 50. A wall is 10 cm on the plan. How long is the wall in real life, in meters?
20
A plan is drawn at 1 : 20. A wall is 25 cm on the plan. How long is the wall in real life, in meters?

What is in this set

The numbers in this set run from 1 to 100.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 100% of the problems: the answer was left in centimeters.
Answers are a decimal.

Drawing 240 problems from this page produced 99 different ones, 41% — 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.