Arithmetic - Number System Flashcards Preview

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Flashcards in Arithmetic - Number System Deck (13)
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1

natural numbers

counting numbers
N=1,2,3,...∞

2

whole numbers

counting numbers & 0
W=0,1,2,3,...∞

3

negative numbers

number less than zero

4

integer

a whole number (not a fractional number) | can be positive, negative, or zero
I=...,-3,-2,-1,0,1,2,3,...

5

even number

a number is even if it is divisible by 2 and remainder is zero

6

odd number

a number is odd if it is not divisible by 2 and remainder is 1

7

prime number

a positive integer with only two factors, 1 and itself

8

prime numbers between 1 and 200

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199

9

composite numbers

a positive integer which is not prime (i.e., has factors other than one and itself)

10

rational numbers

a number which can be expressed in the form p/q, where p and q are integers and q≠0
Example: 3/4, 7/1

11

irrational numbers

a real number that cannot be written as a simple fraction
Example: π = 3.1415.... as a fraction it could only be written as an approximation 22/7

12

imaginary number

i=√-1 useful for calculating the square roots of negative numbers

13

complex number

a combination of real and imaginary numbers
Example: -2+πi, 2+3i