Numerical Classification Quiz Study Guide

A real number is any number that . . .

[Choose two]

• is a prime number
• can be found on the number line
• is a whole number
• can be found in a dictionary
• can be represented by infinite decimal expansion

What numbers belong in the box called "Natural"?

• 1, 3, 5 ...

• 2, 4, 6, 8 ...

• 0, 1, 2, 3 ...

• 1, 2, 3 ...

Which of these would be a good definition for a rational number?

• A rational number is a number that cannot be expressed as a fraction.
• A rational number is a number that has an irrational numerator.
• A rational number is any number that can be represented as a fraction (has terminating or repeating decimals).

• A rational number is a number that is always a whole number.

True or False:

A rational number can be a decimal, fraction, or percent.

• False
• Maybe
• True
• Sometimes

Which of these would be a good definition for an integer?

• A number with a decimal point
• A fraction with a numerator and denominator
• A letter in the alphabet
• A whole number that can be positive, negative, or zero

True or False:

An integer can be a percent, but not a fraction or decimal.

• True. Integers cannot be fractions

• False. It can't be any of the options

• Partially true. An integer can be a fraction and percent, but not a decimal

• Sometimes true. Sometimes an integer can be a percent but it is never a fraction or decimal

Which of these is a good definition for a whole number?

• Odd numbers greater than 5
• Natural numbers and zero

• Fractions and decimals
• Negative integers only

What is a good definition for a natural number?

• A natural number is a positive integer (counting number).

• A natural number is a decimal number.
• A natural number is a fraction.
• A natural number is a negative integer.

What is the smallest subset of real numbers that contain zero?

• Rational numbers

• Natural numbers

• Whole numbers

• Integers

Which of these numbers is a whole number?

• √25
• 0
• 9
• All of the above