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Medical Math

Medical Math. Health Occupations Education Mrs. Rose. Roman Numerals. Used for some drugs and solutions Sometimes used when ordering supplies. Key Numerals. I V X L C D M. 1 5 10 50 100 500 1000. Any number can be formed by using these numerals

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Medical Math

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  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 1 x 10 • II 2 xx 20 • III 3 xxx 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 • VII 5+1+1 = 7 • XI 10+1=11 • LXX 50+10+10=70 • MCL 1000+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 • IX 1 is before 10 (subtract) 10-1=9 • XC 10 is before 100 100-10=90 • CD 100 is before 500 500-100=400

  7. Practice • 1. XXV 6. XLVI • 2. LIV 7. XVII • 3. XIV 8. LXXVII • 4. XXIV 9. XIII • 5. XCI 10. LXXII

  8. Larger Roman Numerals • When reading larger numbers, distinguish the subtracted numbers before adding up the values • Example add • DCXLIX 500 • D-500 100 • C-100 649 • XL 50-10=40 40 • IX 10-1=9 9

  9. PRACTICE • MMCMXXCVII

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

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