1. Medical Math Health Occupations Education Mrs. Rose

2. Roman Numerals Used for some drugs and solutions Sometimes used when ordering supplies

3. Key Numerals I V X L C D M 1 5 10 50 100 500 1000

4. 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

5. 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

6. 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

7. Practice 1. XXV6. XLVI 2. LIV7. XVII 3. XIV8. LXXVII 4. XXIV9. XIII 5. XCI10. LXXII

8. 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

9. PRACTICE MMCMXXCVII

10. M1000 CM 900 (100 before 1000) XXC 80 (20 before 100) V 5 I 1

11. Answer is 2,987

12. 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

13. 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

14. 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

15. __ X X=10 X 1000 10,000