Reading Roman numerals

Difficulty Standard · Set d98csw

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1
What number is CCCXXIII?
2
What number is LXXXVI?
3
What number is CCCLXXXI?
4
What number is CXXXVI?
5
What number is CCLIII?
6
What number is CCXXXIV?
7
What number is CXXII?
8
What number is XCIX?
9
What number is CXLII?
10
What number is CXIV?
11
What number is CC?
12
What number is CX?
13
What number is CLXIX?
14
What number is CCCIV?
15
What number is CXXI?
16
What number is CCLVIII?
17
What number is CCCLXXXV?
18
What number is CLXIX?
19
What number is CLXXII?
20
What number is CLXXXVIII?

What is in this set

The numbers in this set run from 0 to 0.
65% of them add their letters straight through.
35% of them use a subtractive pair such as IV or XC.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 35% of the problems: every letter was added up; a smaller letter written before a larger one is taken away from it.
Answers are a whole number.

Drawing 240 problems from this page produced 176 different ones, 73% — 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.