# number concept kenji yeoh 821

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Math project 821 By Kenji YeohTRANSCRIPT

- 1. Number ConceptKenji Yeoh 821

2. What is number concept? Number concept is having an idea of theconcept of a number. Or, having an idea whata number is. For example, the number one isan odd number higher than zero and smallerthan two. Another example is, a primenumber cannot be divided without the answerbeing a whole number. 3. Number concept chart 4. Number SenseWhen understanding number concept, aperson will also develop number sense.Number sense is understanding and knowingnumbers and using those understandings tosolve and check calculations. For, example, ifodd numbers cannot be divided equally bytwo, a person knows that any odd numberdivided by two will not have a whole numberas an answer 5. What is a number?Number- A symbol used to mark a certainvalue. A number is something that is used torepresent the exact value of something like anapple. Numbers are used everywhere andespecially in math. For example, 1,2,3,4,5, arenumbers. 6. The History of NumbersThe number system was first made in Indiaand the system was transferred and changedover to Europe. First it was the Brahmi, thenthe zero was introduced with the Hindus.After that, Arabians took the numbersystem, changed it again, and the system wastransferred to Europe. 7. Hindu-Arabic System 8. The History of Numbers (Cont.)In Europe, a Roman writer named Beothiusremade the Hindu-Arabic with Apices. Theseapices were used to represent a number andeach had their own name. These apices werelater evolved into the modern-day numeralsystem. 9. Apices 10. The History of Numbers (Cont.) Before the Hindu-Arabic numeric systemwas adopted, Europeans used the RomanNumeral System which consisted of letters likeI,V, and X. 11. Roman Numeral System 12. Types of numbers There multiple types of numbers. The mostbroad groups are real and imaginary numbers.Then there are irrational and rationalnumbers. Then there are integers. Next, iswhole numbers, and finally there are naturalnumbers. 13. The groups of numbers 14. Real and ImaginaryReal numbers are numbers that arepossible. Imaginary numbers are numbers thatare not mathematically possible. Realnumbers for example, are a+b=c. An exampleof an imaginary number is a times a equalsnegative b. Why a times a equals negative b isimaginary is because when a number issquared, it will turn positive. 15. Rational and IrrationalA rational number is a number that can beexpresses as a fraction or a ratio. An irrationalis a number that cant be written as a fractionor a ratio. Examples of rational numbers are1,1/2,0.89, and 35%. Examples of irrationalnumbers are pi and 0.52145679... Allintegers, fractions, and percent are rational.Terminating decimals are rational too andcertain repeating decimals like 0.333.. 16. Integers, whole numbers, and naturalnumbers. Integers are numbers that arentdecimals, fractions, or percents. Examplesare 1,2,-3,-4. Whole numbers areintegers that arent negative. Naturalnumbers are numbers used for counting. 17. Odd and EvenOdd numbers are numbers that whendivide by two, the answer is not an integer.Even numbers are numbers that when dividedby two, the answer is an integer. Examples ofeven numbers are 0,2,10, and 34. 18. Prime and CompositePrime numbers are numbers that have thefactors of one and itself. 1,3,5,7 are examplesof prime numbers. Composite numbers havemore than the factors of one and itself.9,2,6,10 are examples of composite numbers. 19. Prime and Composite Table 20. Factors A factor is an integer that can be used tomultiply another factor to get a certainnumber. For example, the numbers 1,2,4,5,10,are factors of the number twenty. So, twentyis composite. 21. Negative and PositivePositive numbers are numbers greaterthan zero while negative number are numbersless than zero. 22. Decimals, Percents, and FractionsDecimals, percents, and fractions areparts of a number. For example, 0.5, , and50% are all half. Decimals, percents andfractions can also be converted to each otherby using methods of conversion. 23. Example 24. Reference Page http://www.mathleague.com/help/integers/integers.htm http://www.mathsisfun.com/numbers/imaginary-numbers.html http://www.factmonster.com/ipka/A0876704.html http://dictionary.factmonster.com/number http://c2.com/cgi/wiki?PrimeNumber 25. Reference Page http://www.hsv.k12.al.us/dept/etv/number_pdf/number_concept_intro.pdf http://dictionary.reference.com/browse/number http://www.susa-parentcenter.com/preschool-math-concepts.php http://www.archimedes-lab.org/numeral.html 26. Reference Page Number words and number symbols: acultural history of numbers By Karl Menninger 27. Fin