cynthia.anakwe.7brm.unit5

===**__THE NUMBER ZERO __**=== = = = =

1. Where did the number Zero come from? Zero is the inventions of Indians. Zero traveled over the World due to various travelers from England & UK countries. Zero has unique importance in Maths & Technology.

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** 2. ** When did it spread to Europe? In the tenth century the //number zero spread to Europe//

= = ** 3. ** Name the man who brought it to Europe? fibonacci

** 4. ** What city in Italy first used the number Zero? rome = = ** 5. ** Describe what was wrong with the roman numerals number system? they had too many different symbols, making it confusing and difficult to undserstand. The Roman numeral system is [|decimal][|[][|1][|]] but not directly [|positional] and does not include a [|zero]. It is a cousin of the [|Etruscan numerals]. Use of Roman numerals persisted after the decline of the Roman Empire. In the 14th century, Roman numerals were largely abandoned in favor of [|Arabic numerals]; however, they are still in use to this day in minor applications such as numbered lists or outlines, clock faces, numbering of pages preceding the main body of a book, successive political leaders or people with identical names, chords in music, and the numbering of certain annual events.

** 6. ** Contrast the roman numerals to the new number system


 * =Arabic= || =1= || =5= || =10= || =50= || =100= || =500= || =1000= ||
 * =Roman= || =I= || =V= || =X= || =L= || =C= || =D= || =M= ||

These were the normal symbols, but they could only describe numbers up to 3999. The Romans combined their symbols, so VII meant 5+1+1 or seven. This is called a unary system. However, they found that IIII and VIIII were too confusing (for four and nine), so they introduced another idea. If the I comes after the V then you add it (VI is 6). But if the I comes //before// the V then you subtract it (IV is four). The rule is that you are allowed to add up to three (VIII is eight), but only subtract one (IX is nine). This means that you have to be very careful what order Roman digits are in. XI is a different number from IX.

bigger numbers. Here is one way the Romans wrote these bigger numbers.

We still use Roman numbers today. One place where you often see Roman numbers is on a clock face. The hours are marked as I to XII. However, there is something odd about these Roman numbers. If you look at four, it is IIII instead of IV. I think that this is because half of the numbers are upside down, since they follow the edge of the clock face round. You can get IV and VI muddled up when they're the right way up. It is even worse when they're upside down! IX and XI are not such a problem, since they are more or less the right way up. In fact, the Romans never had clocks like this, since this type of clock was invented centuries afterwards

. =__HOW DO ANCIENTS USE NUMBERS?__= = =
 * __The ancients use numbers very badly.__**