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Medical Math Health Occupations Education Mrs. Rose
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Roman Numerals Used for some drugs and solutions Sometimes used when ordering supplies
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Key Numerals I V X L C D M 1 5 10 50 100 500 1000
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Any number can be formed by using these numerals No more than three of any one Roman numeral is used to represent a number. Example – I 1x 10 – II 2xx 20 – III 3xxx 30
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Rules to remember If a numeral for smaller numbers are used after a numeral for larger numbers, all the numbers are added together Example – VII5+1+1 = 7 – XI10+1=11 – LXX50+10+10=70 – MCL1000+100+50=1150
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If the numeral for a smaller number is used in front of the numeral for a larger number, the smaller number is subtracted from the larger number Example – IX1 is before 10 (subtract) 10-1=9 – XC10 is before 100100-10=90 – CD100 is before 500500-100=400
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Practice 1. XXV6. XLVI 2. LIV7. XVII 3. XIV8. LXXVII 4. XXIV9. XIII 5. XCI10. LXXII
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Larger Roman Numerals When reading larger numbers, distinguish the subtracted numbers before adding up the values Exampleadd – DCXLIX500 D-500100 C-100649 XL 50-10=40 40 IX 10-1=9 9
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PRACTICE MMCMXXCVII
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M1000 CM 900 (100 before 1000) XXC 80 (20 before 100) V 5 I 1
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Answer is 2,987
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HOW TO WRITE THEM Break down the numbers in basic components beginning with the largest number Example ---- 273 200+70+3 Break them down again 100+100+50+10+10+1+1+1 CCLXXIII
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MORE PRACTICE BREAKING DOWN 400 100+100+100+100 Remember the rule----no more than three so go the next highest 500 with 100 before it 500-100=400 400 = CD
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Another rule to remember A bar is placed over a roman numeral indicates that roman numeral x 1000 Example ___ M M = 1000 X 1000 1,000,000
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__ X X=10 X 1000 10,000
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