Roman Numerals - Odd One Out Puzzle #2

Which set of Roman Numerals is different.  Why?

What are Roman Numerals?

Solution

Roman Numerals - Crossword Puzzle #3

Roman Numerals Crossword Puzzle

Solve Roman Numerals additions:

DOWN:

1. MDCLIV + MCCX

2. CDXXV + MMCCCVII

4. MMM + DL

6. CCV + CCII

ACROSS:

1. MDCCXLV + MCCLV

3. MCMVIII + CCXCII

5. CCIX + CXLI

7. MDCCCLIII + MDCXLIII

8. LXXXIV + LXXXVI

9. XIV + XV

10. III + IV

Click here to print the crossword puzzle.

Solution

What are Roman Numerals?

Roman Numerals - Odd One Out Puzzle

Which set of Roman Numerals is different.  Why?

What are Roman Numerals?

Solution

Roman Numerals Crossword Puzzle#2

Roman Numerals Crossword Puzzle

Write each number as Roman Numeral:

DOWN:

1.   1,367

2.   2,036

3.   1,153

6.   3,711

ACROSS:

4.   700

5.   1,210

7.   723

8.   2,427

9.   452   

Click here to print the crossword puzzle.

Solution

What are Roman Numerals?

Roman Numerals Crossword Puzzle#1

Roman Numerals Crossword Puzzle

Write each number as Roman Numeral:

DOWN:

1.   853

3.   888

4.   2,944

5.   114

ACROSS:

2.   1,596

6.   3,471

7.   976

8.   151

9.   68   

Click here to print the crossword puzzle.

Solution

What are Roman Numerals?

Roman Numerals Puzzles

A boy in Ancient Rome had a quiz.  He was so absent minded that he made a mistake in each of his equations.

When the teacher checked the quiz, he thought the boy was teasing him, since all of the equations could be corrected by moving just one of elements (I, V, X, L,C, D, M, ---).  See if you can correct the equations.  Forgot how to convert Roman Numerals?  Click here.

Roman Numerals Equation I

Roman Numerals Equation II

Roman Numerals Equation III

Roman Numerals Equation IV

Roman Numerals Equation V

Roman Numerals Equation VI

Answer

Playing with Roman Numerals

In schools and everyday life we are using Arabic numerals, which have 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.  

Ancient Romans used letters from Latin alphabet to write numbers.   There are seven basic letters in Roman numerals: I, V, X, L, C, D, and M.   Each of the letters have certain value and by combining the letters together other numbers are created.

Roman                   Arabic 

I          1

V        5

X        10

L         50

C        100

D        500

M       1,000

How do we create the numbers?

When you write the letters together you add the values, except when the lower value proceeds the higher value. See examples below:

Roman numeral	Equivalent to	Something to keep in mind
I	1	Only I, X, C, and M can be subtracted I can only be subtracted from V or X X can only be subtracted from L or C C can only be subtracted from D or M Never subtract V, L, and D
II	1+1=2
III	1+1+1=3
IV	5-1=4
VI	5+1=6
VII	5+1+1=7
VIII	5+1+1+1=8
IX	10-1=9
XI	10+1=11
XX	10+10=20
XXX	10+10+10=30
Xl	50-10=40
LX	50+10=60
XC	100-10=90
CXX	100+10+10=120
cXL	100+50-10=140
CC	100+100=200
CD	500-100=400
DC	500+100=600
DCC	500+100+100=700
CM	1,000-100=900
MC	1,000+100=1,100

Now the fun begins. Here are some cool examples:

DCCCLXXII

500 + 100 + 100 + 100 + 50 +10 + 10 + 1 + 1 = 872

CMLV

C before M, means 1,000 – 100 = 900,

L = 50

V = 5

900 + 50 + 5 = 955

XCIX 

X before C means 100 – 10 = 90

I before X means 10 – 1 = 9

90 + 9 = 99

How about going the other way:

994 = 900 + 90 + 4

900 = 1,000 – 100, lower value comes before higher: CM

90 = 100 – 10, lower before higher: XC

4 = 5 – 1, lower before higher: IV

CMXCIV

453 = 400 = 50 + 3

400 = 500 – 100, lower before higher: CD

50 = L

3 = III. 

CDLIII

1,640  = 1,000 + 600 + 40

1,000 = M

600 = 500 + 100, means DC

40 = 50 – 10, lower before higher:  XL

MDCXL

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BIBLIOGRAPHY

Adler, David A., Fun With Roman Numerals, Holiday House, New York, 2008.