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Page 1: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

EQ: How do you read and write Roman Numerals?

Page 2: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Where do you see Roman Numerals?

• Super Bowl & Olympics

• Movies

• Clocks

• Outlines

• Books

• Names (Henry VIII)

Page 3: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

• Roman numerals are part of the ancient Roman number system that remains in use today. The history of Roman numerals dates back to 1st millennium BC when they were used to record numbers in stone, art and coins.

• Roman numerals add a classic style that Arabic numerals cannot. Arabic (decimal) numbers ( 0 to 9 ) were introduced into Europe about 900 AD and were adopted quickly for their convenience and mathematical ease of use.

Page 4: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Let’s Learn the Roman Numerals…

• I = one

• V = five

• X = ten

• L = fifty

• C = 100

• D = 500

• M = 1,000

There isn’t a symbol for zero.

Page 5: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

The Rules for Writing Roman Numerals

• The letters should be arranged from largest to smallest.– 1510 is written MDX, largest to smallest

• Only powers of ten can be repeated. • Don’t repeat a letter more than three times in a

row.– 100 is written C, not XXXXXXXXXX (too many

repeats)

Page 6: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Rules Continued

• Numbers can be written using subtraction. • If you place any smaller number in front of a

larger number it symbolizes subtraction. • For example, IV=4. It is really saying that 5 - 1

equals 4.– Only powers for ten (I, X, C) can be subtracted.

– I can only be subtracted from V or X

Page 7: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Practice

• 515 = ?• 39 = ?

• 1005 = ?• 32 = ?• 9= ?

Page 8: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Answers

• 515 = DXV

• 39 = XXXIX

• 1005 = MV

• 32 = XXXII

• 9= IX

Page 9: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Adding Roman Numerals

• Write down the two numbers you are adding right next to each other

• Rearrange the letters so they start with the largest and end with the smallest.

• Then start combining similar letters.• Check you answer by adding the Arabic numbers.

Page 10: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Now Let’s Try Adding

Problem1. 23 + 58

Page 11: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Answer to the Adding Problem

Step 1. 23 + 58

Step 2. XXIII + LVIII

Step 3. XXIIILVIII

Step 4. LXXVIIIIII

Step 4. IIIIII = VI

Step 5. LXXVVI

Step 6. VV = X

Step 7. LXXXI = 81

Step 8. 23 + 58 = 81

Roman Numeral Number

I 1

V 5

X 10

L 50

C 100

D 500

M 1000

Page 12: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

REALLY BIG NUMBERS!

If there is a line under the Roman Numeral “V, X, L, C, D, or M” it means to add 3 zeros (multiply it by 1,000).

V would mean 5,000.

VIV

IXLII

Page 13: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Now try these:

1. XXXVI2. XL3. XVII4. DCCLVI5. MCMLXIX

Page 14: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

Click on the number that matches the Roman Numeral.

Page 15: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

1.LXIII

A. 53

B. 63

C. 113

Page 16: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

OOPS! Try again!

Page 17: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

You are correct! LXIII = 50+10+3 = 63

L=50; X=10; III=3

Remember:

Page 18: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

2.DCXXIV

A. 624

B. 1624

C. 5524

Page 19: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

OOPS! Try again!

Page 20: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

You are correct! DCXXIV= 500+100+20+4=

624

Page 21: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

3. CCL

A. 150

B. 250

C. 550

Page 22: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

OOPS! Try again!

Page 23: EQ: How do you read and write Roman Numerals? Where do you see Roman Numerals? Super Bowl & Olympics Movies Clocks Outlines Books Names (Henry VIII)

You are correct! CCL = 100+100+50=250


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