Groups of Numbers Flashcards

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1
Q

Natural or Counting Numbers

A

the numbers 1, 2, 3, 4

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2
Q

whole numbers

A

the numbers 0, 1, 2, 3, 4. whole numbers are counting numbers plus 0

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3
Q

Integers

A

The numbers -1, -2, 0, 1, 2

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4
Q

Negative Integers

A

The numbers -3, -2, -1

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5
Q

Positive Integers

A

The natural numbers are sometimes called positive integers

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6
Q

Rational Numbers

A

The numbers that can be expressed as fractions using integers are called rational numbers. Values such as 1 1/2 = 3/2 or 0.875 = 7/8 are called rational numbers. Since every integer can be expressed as that integer over 1, all integers are rational numbers. Zero is a rational number since 0/1 = -

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7
Q

Irrational numbers

A

the numbers whose exact values cannot be expressed as fractions are called irrational numbers. Two examples of irrational numbers are sqrt of 3 and pi

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8
Q

Real numbers

A

real numbers consist of all rational and irrational numbers. typically, most standardized exams use only real numbers, which are commonly used numbers in everyday math calculations

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9
Q

Prime numbers

A

a prime number is a natural number greater than 1 that can be evenly divided only by itself. for example, 19 is a prime number because it can be evenly divided only by 19 and 1, but 21 is not a prime number because 21 can be evenly by other number (3 and 7). the only even prime number is 2; thereafter any even numbermay be divided evenly by 2. therefore any even number greater than 2 is not a prime number. zero and 1 are not prime numbers

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10
Q

what are the first 10 prime numbers

A

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

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11
Q

composite number

A

A composite number is a natural positive number greater than 1 and divisible by more than just 1 and itself. 4, 6, 8, 9, 10, 12, 14, 15

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12
Q

odd numbers

A

are integers not divisible by 2

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13
Q

even numbers

A

even numbers are integers divisible by 2

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14
Q

squares

A

squares are the result when numbers are raised to the second power

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15
Q

cubes

A

cubes are the result when numbers are raised to the third power

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