our number system is called arabic we have ten digits and we can make as big a number as we want
TRANSCRIPT
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ROMAN NUMERALS
Made by M.Federica De Gasperis –
Teacher of Primary School in IC Leonori di Roma
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OUR NUMBER SYSTEM IS CALLED ARABIC
WE HAVE TEN DIGITS
AND WE CAN MAKE AS BIG A NUMBER AS WE WANT
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THESE FIGURES ARE SO BECAUSE THE ARABS COUNTED THE CORNERS
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THE ROMANS HAD DIFFERENT SYMBOLS FOR
NUMBERS
THE ROMANS HAD NOT SYMBOL FOR ZERO (O)
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V + I + I = VIIFIVE + ONE + ONE = SEVEN
IN THIS EXAMPLE THE PRINCIPLE OF ADDITION
IS USED
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I 1 one V 5 fiveX 10 tenL 50 fiftyC 100 one hundredD 500 five hundredM 1000 one thousand
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ADDITION IN ONLY APPLICABLE WHEN THE FIRST
NUMBER IS GREATER THAN THE SECOND, THIRD …
XI is 11XX is 20XI is 11
LXX is 70CX is 110
MC is 1100
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COLOSSEUM
ITS CONSTRUCTION STARTED UNDER EMPEROR VESPASIANO IN
LXXIIAND WAS COMPLETED UNDER TITUS IN
LXXX
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ST. PETER BASILICA
THE CONSTRUCTION BEGAN INMDVI
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ARC OF COSTANTHINE
DEDICATED IN
CCCXV
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GAIUS IULIUS CAESAR
HE WAS BORN IN
CI A.B.AND WAS ASSASINATEDON THE IDES OF MARCH (15 MARCH)
XLIV A.B.
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X L I V = 4 4
IN THIS EXAMPLE THE PRINCIPLE OF SUBTRACTION IN USED
SUBTRACTION IN ONLY APPLICABLE WHE THE FIRST SYMBOL IS LESS THAN
THE SECOND ONE.
IV is 4
IX is 9
XC is 14
CM is 90
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CDXLI
THIS EXAMPLE COMBINES PRINCIPLE OF ADDITION AND SUBTRACTION
MCD is 1400
CMLX is 960
XIV is 14
CXL is 140
MCMLVIII is 1958
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IMPORTANT
• WHEN THE PRINCIPLE OF ADDITION IS USED, A SYMBOL CAN BE USED 3 TIMES ONLY
• PRINCIPLE OF MULTIPLICATION
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REMEMBER
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THANK YOU.
BYE, BYE!