Roman Numerals: A Brief History and Conversion Guide, Schemes and Mind Maps of History

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Roman Numerals

A Brief History of Roman Numerals

 Roman numerals originated in ancient Rome. This ancient counting system is believed to have started with the ancient Etruscans.  The symbol for one in the roman numeral system probably represented a single tally mark which people would notch into wood or dirt to keep track of items or events they were counting. It would also be easy to write on a wax tablet.

As a general guide

 Roman Numerals are made up by adding or subtracting numbers like this:-  11=10+1 = XI 9 = 10 – 1 = IX  40 = 50 – 10 = XL  If you want to say 1,100 in Roman Numerals, you would say M for 1000 and then put a C after it for 100 ; 1,100 = MC  900 =1000 – 100 so the C comes before M = CM

 Some more examples:  VIII = 5+3 = 8  XIX = 10+ 9 = 19  (Remember 9 is always = IX (1 less than 10)  XL = 50-10 = 40  XC = 100-10 = 90  Try these on whiteboards: 7 = 12 = 15 = 20 =

Can you convert these numbers to

Roman Numerals?

 32 = 35 = 50 = so 40 =  44 = 49 = 58 = 60 =

Were you correct?

 17=XVII 22=XXII 26=XXVI 29=XXIX

 30=XXX 32=XXXII 35=XXXV

 50=L so 40=XL  44=XLIV 49=XLIX 58=LVIII 60=LX

How well did you do?

 70 = LXX 80 = LXXX 83 =LXXXIII

 88 = LXXXV111 89 =LXXXIX

 100 = C so 90 =XC  120 =CXX 150 =CL 200 = CC  300 = CCC 500 = D so 400 = CD

Some more large numbers to try.

 1000 = so 900 =  1600 = 1700 = 1900 =  2000 =

Last one.

 Can you convert 2020?  MMXX Now try to write today’s date. Day / Month / Year  Well done. You are a Roman Numeral Converter!