GCF of 8 and 16
2026-02-28 23:38 Diff
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Last updated on September 11, 2025

The GCF is the largest number that can divide two or more numbers without leaving any remainder. GCF is used to share items equally, to group or arrange items, and schedule events. In this topic, we will learn about the GCF of 8 and 16.

What is the GCF of 8 and 16?

The greatest common factor of 8 and 16 is 8. The largest divisor of two or more numbers is called the GCF of the number. If two numbers are co-prime, they have no common factors other than 1, so their GCF is 1. The GCF of two numbers cannot be negative because divisors are always positive.

How to find the GCF of 8 and 16?

To find the GCF of 8 and 16, a few methods are described below:

  1. Listing Factors
  2. Prime Factorization
  3. Long Division Method / by Euclidean Algorithm

GCF of 8 and 16 by Using Listing of Factors

Steps to find the GCF of 8 and 16 using the listing of factors:

Step 1: Firstly, list the factors of each number.

Factors of 8 = 1, 2, 4, 8.

Factors of 16 = 1, 2, 4, 8, 16.

Step 2: Now, identify the common factors of them. Common factors of 8 and 16: 1, 2, 4, 8.

Step 3: Choose the largest factor. The largest factor that both numbers have is 8. The GCF of 8 and 16 is 8.

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GCF of 8 and 16 Using Prime Factorization

To find the GCF of 8 and 16 using the Prime Factorization Method, follow these steps:

Step 1: Find the prime factors of each number.

Prime Factors of 8: 8 = 2 × 2 × 2 = 2³

Prime Factors of 16: 16 = 2 × 2 × 2 × 2 = 2⁴

Step 2: Now, identify the common prime factors. The common prime factors are: 2 × 2 × 2 = 2³

Step 3: Multiply the common prime factors. 2³ = 8. The Greatest Common Factor of 8 and 16 is 8.

GCF of 8 and 16 Using Division Method or Euclidean Algorithm Method

Find the GCF of 8 and 16 using the division method or Euclidean Algorithm Method. Follow these steps:

Step 1: First, divide the larger number by the smaller number. Here, divide 16 by 8. 16 ÷ 8 = 2 (quotient), The remainder is calculated as 16 − (8×2) = 0.

The remainder is zero, so the divisor becomes the GCF. The GCF of 8 and 16 is 8.

Common Mistakes and How to Avoid Them in GCF of 8 and 16

Finding the GCF of 8 and 16 looks simple, but students often make mistakes while calculating the GCF. Here are some common mistakes to be avoided by students.

Problem 1

There are 8 apples and 16 oranges. A vendor wants to pack them into boxes with the largest number of fruits in each box. How many fruits will be in each box?

Okay, lets begin

We should find the GCF of 8 and 16. The GCF of 8 and 16 is 8.

There are 8 fruits in each box. 8 ÷ 8 = 1

16 ÷ 8 = 2

There will be 8 boxes, and each box gets 1 apple and 2 oranges.

Explanation

As the GCF of 8 and 16 is 8, the vendor can make boxes with 8 fruits each. Now divide 8 and 16 by 8. Each box gets 1 apple and 2 oranges.

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Problem 2

A school wants to arrange 8 red balloons and 16 blue balloons in rows with the same number of balloons in each row, using the largest possible number of balloons per row. How many balloons will be in each row?

Okay, lets begin

The GCF of 8 and 16 is 8. So each row will have 8 balloons.

Explanation

There are 8 red and 16 blue balloons. To find the total number of balloons in each row, we should find the GCF of 8 and 16. There will be 8 balloons in each row.

Well explained 👍

Problem 3

A painter has 8 meters of red ribbon and 16 meters of blue ribbon. She wants to cut both ribbons into pieces of equal length, using the longest possible length. What should be the length of each piece?

Okay, lets begin

For calculating the longest equal length, we have to calculate the GCF of 8 and 16. The GCF of 8 and 16 is 8. The ribbon is 8 meters long.

Explanation

For calculating the longest length of the ribbon, first we need to calculate the GCF of 8 and 16, which is 8. The length of each piece of the ribbon will be 8 meters.

Well explained 👍

Problem 4

A carpenter has two wooden planks, one 8 cm long and the other 16 cm long. He wants to cut them into the longest possible equal pieces, without any wood left over. What should be the length of each piece?

Okay, lets begin

The carpenter needs the longest piece of wood. The GCF of 8 and 16 is 8. The longest length of each piece is 8 cm.

Explanation

To find the longest length of each piece of the two wooden planks, 8 cm and 16 cm, respectively, we have to find the GCF of 8 and 16, which is 8 cm. The longest length of each piece is 8 cm.

Well explained 👍

Problem 5

If the GCF of 8 and ‘b’ is 4, and the LCM is 32, find ‘b’.

Okay, lets begin

The value of ‘b’ is 16.

Explanation

GCF × LCM = product of the numbers

4 × 32 = 8 × b

128 = 8b

b = 128 ÷ 8 = 16

Well explained 👍

FAQs on the Greatest Common Factor of 8 and 16

1.What is the LCM of 8 and 16?

The LCM of 8 and 16 is 16.

2.Is 8 divisible by 2?

Yes, 8 is divisible by 2 because it is an even number.

3.What will be the GCF of any two prime numbers?

The common factor of prime numbers is 1 and the number itself. Since 1 is the only common factor of any two prime numbers, it is said to be the GCF of any two prime numbers.

4.What is the prime factorization of 16?

The prime factorization of 16 is 2⁴.

5.Are 8 and 16 prime numbers?

No, 8 and 16 are not prime numbers because both of them have more than two factors.

Important Glossaries for GCF of 8 and 16

  • Factors: Factors are numbers that divide the target number completely. For example, the factors of 8 are 1, 2, 4, and 8.
  • Multiple: Multiples are the products we get by multiplying a given number by another. For example, the multiples of 4 are 4, 8, 12, 16, 20, and so on.
  • Prime Factors: These are the factors of a number that are prime numbers and divide the given number completely. For example, the prime factors of 16 are 2.
  • Remainder: The value left after division when the number cannot be divided evenly. For example, when 10 is divided by 3, the remainder is 1 and the quotient is 3.
  • LCM: The smallest common multiple of two or more numbers is termed LCM. For example, the LCM of 8 and 16 is 16.

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Hiralee Lalitkumar Makwana

About the Author

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.

Fun Fact

: She loves to read number jokes and games.