Real Number System

Front

What is a rational number?

Back

A rational number is any number that can be expressed as a fraction, where both the numerator and the denominator are integers, and the denominator is not zero.

Front

What is an irrational number?

Back

An irrational number is a number that cannot be expressed as a simple fraction. It cannot be written as a ratio of two integers.

Front

Which of the following is a natural number? 0, 1, 2, 3, ...

Back

Natural numbers are the set of positive integers starting from 1: 1, 2, 3, 4, ... (0 is not included).

Front

Is 10/2 a natural number?

Back

True, 10/2 equals 5, which is a natural number.

Front

What are whole numbers?

Back

Whole numbers are all natural numbers including zero: 0, 1, 2, 3, ...

Front

What is the difference between whole numbers and natural numbers?

Back

Natural numbers start from 1, while whole numbers include 0.

Front

Give an example of a rational number that is not a whole number.

Back

3.14 is a rational number that is not a whole number.

Front

What is the square root of 25?

Back

The square root of 25 is 5, which is a whole number.

Front

Back

Front

What are integers?

Back

Integers are whole numbers that can be positive, negative, or zero: ..., -3, -2, -1, 0, 1, 2, 3, ...