Could a person who has not learned about Roman numerals work out which centurian does not get a shield?
Topics: Starter  Arithmetic
We dropped the beat on Roman Numerals today..@kolschofficial @SwimmingInMaths @Mr_Nic_Teach @MathsNoProblem @mrmarchayes @grahamandre #FNA pic.twitter.com/0LgOQAcL0R
— Mr. Jennings (@MrJenningsFNA) March 2, 2017
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=October25
Here is the URL which will take them to an interactive jigsaw puzzle of Roman numerals.
If you are not an expert on Roman numerals here is an explanation:
Symbol  Value 
I  1 
V  5 
X  10 
L  50 
C  100 
D  500 
M  1,000 
Numbers are formed by combining symbols together. So II is two ones, i.e. 2, and XIII is a ten and three ones, i.e. 13. There is no zero in this system, so 207, for example, is CCVII, using the symbols for two hundreds, a five and two ones. 1066 is MLXVI, one thousand, fifty and ten, a five and a one.
Symbols are placed from left to right in order of value, starting with the largest. However, in a few specific cases, to avoid four characters being repeated in succession (such as IIII or XXXX) these can be reduced using subtractive notation as follows:
Explanation adapted from the Wikepedia article on Roman numerals.
Which clockface is the odd one out?
The answer can be found by looking closely at the roman numerals used.
Investigate which system of numbers is most common on clocks in your school, home or place of work.