number

Number Notion

A VERY BRIEF HISTORY OF NUMBERS

One knows who invented numbers, but it’s fun to think that some early caveman named Oog did it when he said “uhn,” “uhn uhn,” and ‘uuuuuuhhhn” which meant “one.” “two.” and “lots.”

Tallying

The earliest written numbers were most likely tallies simple lines that cache represent one object. You have probably – used them yourself to keep score in a game with a friend:

Roman Numerals

The Roman numerals, invented by yes, you guessed it! The Romans, served many people over many centuries, and have not been forgotten today. Can you think of how they might be used?

The rules for reading the Roman numerals sound difficult but are actually very simple, once you get the hang of it:

1. When a symbol is followed by a smaller symbol or

Symbols, you add up their values.

For example: VI = 6: CXXIII = 123: DII = 502.

II. When a symbol or symbols are followed by a larger.

Value symbol, you subtract their values:

For example: IV = 4: CMXL = 940: CDII = 402.

So, the numbers for 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 are I. II. III. IV V VI VII, VIII, IX, and X. Are you beginning to catch on? If so, see if you can handle the following puzzles.

It’s about Time! Today, Roman numerals are most often used to show time (see if you have a clock in your house that uses Roman numerals) and dates (try to find Roman numerals on old buildings and also in movies and videos

Figure This Out Which face would you see on a

grandfather clock

Grandfather clocks use Roman numerals for each hour, but with a surprise: Four o’clock is represented with IIII instead of IV! See if you can find a watch with Roman numerals on its face and check out four o’clock

Grandfather clocks use Roman numerals for each hour, but with a surprise: Four o’clock is represented with IIII instead of IV! See if you can find a watch with Roman numerals on its face and check out four o’clock

Try This

Read All about it! Want to practice your Roman numerals? How about counting a thousand squealing pigs? Just grab Roman Numerals I to MM by Arthur Geisert (Houghton Mifflin Company1996) and let the fun begin. We’ll bet You never knew there could be so many pigs in one picture!

a  b  e  i  m  
  XIV    XXIX  VIII  LXI  CDXI
n  r  s  t  u  
  CXLIX  MDCVI  DCCLI  MMDCLX  CMXXII

WORDS KNOW

Digit: A number but also a word for “finger. Coincidence? We think not. It’s very likely that the first people to start counting used their fingers-just as little kids continue to do today.

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