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What are all the factors, the prime factorization, and factor pairs of 40?

To find the factors of 40, divide 40 by each number starting with 1 and working up to 40

Now let us find how to calculate all the factors of 40:
2
= 20
4
= 10
5
= 8
As you can see, the factors of 40 are:
1, 2, 4, 5, 8, 10, 20, 40

Introduction to Factors

Factors are the building blocks of numbers in arithmetic that, when multiplied together, result in a given number. With 40 as our illustrative example, we explore the concept of factors and their significance. Factors of 40 are the numbers we multiply together to get 40. Understanding these factors sheds light on the structure and properties of 40 within mathematics.

What are Factors of 40?

The factors of 40 are the numbers that divide 40 without leaving a remainder. These are integral to understanding the division properties of 40. Below, we see a visual representation and a list of the factors of 40:

• 1 x 40 = 40
• 2 x 20 = 40
• 4 x 10 = 40
• 5 x 8 = 40

How to Find the Factors of 40?

To find the factors of 40, we can use the division method. This involves dividing 40 by integers that result in a whole number quotient, indicating they are a factor of 40. For instance:

• 40 ÷ 1 = 40, thus 1 is a factor of 40
• 40 ÷ 2 = 20, thus 2 is a factor of 40
• 40 ÷ 4 = 10, thus 4 is a factor of 40
• 40 ÷ 5 = 8, thus 5 is a factor of 40
• 40 ÷ 8 = 5, thus 8 is a factor of 40
• 40 ÷ 10 = 4, thus 10 is a factor of 40
• 40 ÷ 20 = 2, thus 20 is a factor of 40
• 40 ÷ 40 = 1, thus 40 is a factor of itself

Following this method, no other integers will divide 40 to produce a whole number, hence these are the factors of 40.

Pair Factors of 40

Pair factors of 40 are two numbers that, when multiplied together, equal 40, including both positive and negative products. Below is a list of positive and negative pair factors of 40:

Positive Pair Factors Negative Pair Factors
(1, 40) (-1, -40)
(2, 20) (-2, -20)
(4, 10) (-4, -10)
(5, 8) (-5, -8)

Prime Factorization of 40

The prime factorization of 40 involves breaking it down into prime numbers that, when multiplied together, result in 40. Follow these steps:

• Divide 40 by its smallest prime factor, which is 2: 40 ÷ 2 = 20
• Continue dividing by 2: 20 ÷ 2 = 10
• And again: 10 ÷ 2 = 5
• Now 5 is a prime number and a factor of 40

The prime factorization of 40 is thus 2 × 2 × 2 × 5 or 2³ × 5.

Important Points to Remember

When discussing the factors of 40, keep these points in mind:

• The total number of factors for 40 is 8.
• Prime factors of 40 are 2 and 5.
• Pair factors include (1, 40), (2, 20), (4, 10), and (5, 8).
• The sum of all factors of 40 (1+2+4+5+8+10+20+40) is 90.

Exercises

• Q1. Are the numbers 7 and 14 factors of 40?
• Q2. What is the product of the prime factors of 40?
• Q3. How many positive pair factors does 40 have?

Solutions to Exercises

• A1. No, neither 7 nor 14 are factors of 40 as they don’t divide 40 completely.
• A2. The product of the prime factors of 40 (2³ × 5) is 40.
• A3. 40 has four positive pair factors: (1, 40), (2, 20), (4, 10), and (5, 8).

What are the Factors of 40?

The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.

What are the Prime Factors of 40?

The prime factors of 40 are 2 and 5.

What two numbers equal 40 when multiplied together?

There are several pairs of numbers that equal 40 when multiplied together, including (1, 40), (2, 20), (4, 10), and (5, 8).