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29 07, 2017

Percents, fractions, and decimals

By |2017-07-29T16:45:17-07:00July 29th, 2017|Math|0 Comments

Each penny is 1% of a dollar. Percent comes from the Latin words "per cent". That means "out of a hundred," like there are 100 cents in a dollar. So "ten per cent" means ten out of every hundred. A dime is ten percent of a dollar. A dollar is ten percent of [...]

27 07, 2017

Simple equations – Algebra

By |2019-05-30T10:57:13-07:00July 27th, 2017|Math|0 Comments

Simple equations on a graph Start by thinking of a number line When we learn to add and subtract, multiply and divide, we think of numbers as being all along the number line. But in algebra we think about numbers as being in a plane. Number lines What is algebra? Medieval Islamic math All our math articles Another number line crosses it Picture two number [...]

27 07, 2017

Medieval Islamic mathematics

By |2019-10-07T05:03:36-07:00July 27th, 2017|Islam, Math|0 Comments

Indian numbers and medieval Islamic mathematics Indian numbers About 630 AD, just before the Islamic empire got started, people in West Asia learned from traders or traveling scholars about "Arabic" numbers. Indian mathematics The invention of zero Medieval Islamic science All our Islamic Empire articles This new way of writing numbers really came from India. The Arabic word for [...]