ACT Practice - Number and Quantity

Front

What is the definition of 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 is the difference between a rational number and an irrational number?

Back

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

Front

What is the formula for calculating the average (mean) of a set of numbers?

Back

The average is calculated by adding all the numbers together and then dividing by the count of the numbers.

Front

How do you convert a fraction to a decimal?

Back

To convert a fraction to a decimal, divide the numerator by the denominator.

Front

What is the least common multiple (LCM) of two numbers?

Back

The least common multiple of two numbers is the smallest multiple that is evenly divisible by both numbers.

Front

What is the greatest common divisor (GCD) of two numbers?

Back

The greatest common divisor of two numbers is the largest number that divides both of them without leaving a remainder.

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 the difference between a whole number and an integer?

Back

Whole numbers are non-negative integers (0, 1, 2, ...), while integers include both positive and negative whole numbers.

Front

What is a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is a composite number?

Back

A composite number is a natural number greater than 1 that is not prime, meaning it has more than two positive divisors.