Number system class 9

Front

What is a rational number?

Back

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Front

What are the types of numbers in the number system?

Back

The main types of numbers are: Natural numbers, Whole numbers, Integers, Rational numbers, Irrational numbers, and Real numbers.

Front

What is an integer?

Back

An integer is a whole number that can be positive, negative, or zero, but cannot be a fraction or decimal.

Front

What is a co-prime number?

Back

Co-prime numbers are two or more numbers that have no common factors other than 1.

Front

Which of the following is NOT a natural number: -14, 0, 1, 5?

Back

-14 is NOT a natural number.

Front

What is the square root of 0.04?

Back

The square root of 0.04 is 0.2.

Front

What is a real number?

Back

A real number includes all the rational and irrational numbers, representing all points on the number line.

Front

What is the difference between rational and irrational numbers?

Back

Rational numbers can be expressed as fractions, while irrational numbers cannot be expressed as fractions and have non-repeating, non-terminating decimal expansions.

Front

What is the result of -4.5 - (-5)?

Back

The result is 0.5, which is a positive number.

Front

What are whole numbers?

Back

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