Arithmetic - Number System Flashcards Preview

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Flashcards in Arithmetic - Number System Deck (13)
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1
Q

natural numbers

A

counting numbers

N=1,2,3,…∞

2
Q

whole numbers

A

counting numbers & 0

W=0,1,2,3,…∞

3
Q

negative numbers

A

number less than zero

4
Q

integer

A

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

5
Q

even number

A

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

6
Q

odd number

A

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

7
Q

prime number

A

a positive integer with only two factors, 1 and itself

8
Q

prime numbers between 1 and 200

A

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
Q

composite numbers

A

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

10
Q

rational numbers

A

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
Q

irrational numbers

A

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
Q

imaginary number

A

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

13
Q

complex number

A

a combination of real and imaginary numbers

Example: -2+πi, 2+3i