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100 or "one hundred"

• Roman numeral: C
• In medieval times, there was a "short hundred" (100) and a "long hundred" (120)
• 100 is a natural number (used for counting and ordering)

Brief history of numbers

• Primitive numbering started with tally marks
• The first major innovation in abstraction was the use of numerals to represent numbers
• Roman numerals evolved from tally marks
• Another major innovation was the numeral 0 (zero)
• The base-60 Babylonian numeral system was the first known positional notation system
• The numeral system we all use today is the Hindu-Arabic numeral system invented between the 1st and 4th centuries by Indian mathematicians

100 math facts

Other fun facts

• 100 is the atomic number of Fermium (Fm), which was first discovered in the fallout of the first successful hydrogen bomb test
• The Kármán line (100 km above the Earth's sea level) is commonly used to define the boundary between Earth's atmosphere and outer space
• The US senate has 100 senators
• In Greece, India, Israel and Nepal, 100 is the police telephone number
• In the UK, 100 is the operator telephone number
• An HTTP status code of 100 indicates that the client should continue with its request

100 degrees!

On the Celsius scale, 100 degrees is the boiling temperature of pure water at sea level (with zero being the freezing point)

Some people think 100 degrees in the Fahrenheit scale makes more sense because the 0-100 scale better represents the extremes of a habitable temperature range for humans

Numeral systems

• We use a base-10 system
• Computers use a base-2 system (binary)

Why do we use base-10?

Probably because we have 10 fingers. Duh.

Why do we have 10 fingers?

• The Limb Law: a formula for determining the optimal number of limbs of a certain length
• All mammals have five digits (or the remnants of five digits)
• Extra fingers wouldn't really help much
• We've got a good grip on things
• It works

Numerology

• The number 100 represents energy that's self-determined, independent, and has infinite potential
• The number 1 represents independence, leadership qualities, and the ability to work alone
• The number 0 represents openness, wholeness, comprehensiveness, and infinity
• The two energies, 0 representing all that is and 1 representing aloneness, may appear to be incompatible, but they enhance each other when combined
• With the influence of both the number 1 and the number 0, 100 can be seen as a virtually unlimited number 1

Centenarians

• A centenarian is a person who lives to be at least 100 years old
• In 2012, the UN estimated that there were 316,600 living centenarians worldwide
• According to the UK ONS, a third of babies born in 2013 in the UK are expected to live to 100
• About 1 in 1,000 centenarians make it to 110 years old, making them "supercentenarians"
• Japan has the highest number and highest proportion of centenarians, but the female:male ratio is around 7:1

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