# zero

10 09, 2017

## Science in Central America and South America

By |2019-09-17T10:58:26-07:00September 10th, 2017|Central America|3 Comments

A rubber ball made by the Olmec people (about 1000 BC) Invention of rubber With different natural resources available to them, the people of South America and Central America invented different things than [...]

29 07, 2017

## What is zero? Zero and place value

By |2017-07-29T17:35:52-07:00July 29th, 2017|Math|Comments Off on What is zero? Zero and place value

A math problem showing place value How can you add big numbers without an abacus? You still group the sheep (or whatever) just as you did when you were using the abacus, but [...]

29 07, 2017

## Numbers and math

By |2018-04-24T07:56:24-07:00July 29th, 2017|History|Comments Off on Numbers and math

A number line is infinite in both directions. Numbers are a convenient way for people to organize their thoughts about space and time. First we can think of zero as a point, taking up no [...]

29 07, 2017

## What are fractions? – Math

By |2019-06-12T09:13:22-07:00July 29th, 2017|Math|Comments Off on What are fractions? – Math

A fraction of a pie: What are fractions? We started with whole numbers When we first thought about the number line, we counted only in whole numbers - we went straight from zero [...]

29 07, 2017

## Decimals and fractions – Numbers

By |2017-07-29T14:49:06-07:00July 29th, 2017|Math|Comments Off on Decimals and fractions – Numbers

A number line is infinite in both directions. Decimals, like fractions, are a way of describing points on the number line that fall in between the whole numbers. If you were using fractions, you'd [...]

22 07, 2017

## Invention of Zero – Indian Numbers

History of Math: Counting tokens from Mehrgarh in Late Stone Age India Indian counting tokens and base 10 The first Indian numbers appeared in the late Stone Age, about 4000 BC. Around this time, [...]

22 07, 2017

## Ancient Indian Science and Math

Ancient Indian science: Mohenjo Daro (ca. 2000 BC) From the time of the Harappans to the time of the Islamic conquests, Indian scientists and mathematicians were leaders. Ancient Indian science especially stood out in mathematics and [...]

20 07, 2017

## Guptan Empire in Ancient India

By |2019-07-29T12:04:31-07:00July 20th, 2017|History, India|Comments Off on Guptan Empire in Ancient India

Guptan Empire: Coin of Samudragupta Chandragupta builds an empire In 319 AD, King Chandragupta I managed to conquer all of northern India. He built northern India into a great empire again. [...]

7 06, 2017

## Math and Numbers in Ancient China

By |2019-10-15T09:08:44-07:00June 7th, 2017|China, Science|Comments Off on Math and Numbers in Ancient China

Chinese numbers: number rods Chinese numbers People in China were using written numbers by about 1500 BC, in the Shang Dynasty. This is about two thousand years later than people began [...]

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