Flashcards in Arithmetic - Number System Deck (13)

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## 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,...

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## even number

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

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## odd number

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

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## prime number

### a positive integer with only two factors, 1 and itself

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## 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

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## composite numbers

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

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## 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

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## 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

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## imaginary number

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

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