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Why do bc years countdown?

B.C. years are like negative numbers on a numberline counting down then counting up again once it hits A.D. (A.D. years are positive numbers on a number line)


How was the calendar related to math?

Because math are numbers which are needed to work out years, months, weeks and days of the calendar


Why do you estimate when adding or subtracting decimal numbers?

In more than 40 years as a mathematician, I have never needed to do so.


Which people created a number system?

Numbers have been used by primitive humans for hundreds of thousands of years. Numbers are apparently needed for calculating how many fish hunters have in storage, how many fish are being consumed each day, and many other calculations necessary for their survival.


How many negative years are there?

Well, not negative. But most people use the Gregorian Calendar. And whe use BC and AC to indicate Before and After Christ, but does not mean the Before are negative years. It's just an event in history that set a mark for calendars.


What does it mean to have a negative value when you are working with years?

If you are finding the year a certain number of years from a previous one (e.g. 4000 years from the current year, 2010) then a negative value indicates time BCE (as opposed to CE). Some people prefer to call these BC and AD.


When were hand tools invented?

Hand tools go back thousands of years and were invented as people needed them.


Why did Aztecs sacrifice people?

they would sacrifice people in ceromonies every 52 years because they believed they needed to do that in order for the sun to rise


How many years of college are needed to become a teacher in California?

Four Years are needed


How many years of college experience needed to be in the WNBA?

How many years are needed in college to be in the WNBA?


Is it negative to ground or positive to ground?

On most cars and trucks made in the last 60 years it is negative ground.On most cars and trucks made in the last 60 years it is negative ground.


Numbers of years presidents are elected for?

4 years or more only if they get re elected by the people of the United States Of America!!!!