Summarize this article:
101 LearnersLast updated on September 18, 2025
GCF of 63 and 49
The GCF is the largest number that can divide two or more numbers without leaving any remainder. GCF is used to share the items equally, to group or arrange items, and schedule events. In this topic, we will learn about the GCF of 63 and 49.
What is the GCF of 63 and 49?
The greatest common factor of 63 and 49 is 7. 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 63 and 49?
To find the GCF of 63 and 49, a few methods are described below
- Listing Factors
- Prime Factorization
- Long Division Method / by Euclidean Algorithm
GCF of 63 and 49 by Using Listing of factors
Steps to find the GCF of 63 and 49 using the listing of factors
Step 1: Firstly, list the factors of each number
Factors of 63 = 1, 3, 7, 9, 21, 63.
Factors of 49 = 1, 7, 49.
Step 2: Now, identify the common factors of them Common factors of 63 and 49: 1, 7.
Step 3: Choose the largest factor The largest factor that both numbers have is 7. The GCF of 63 and 49 is 7.
GCF of 63 and 49 Using Prime Factorization
To find the GCF of 63 and 49 using the Prime Factorization Method, follow these steps:
Step 1: Find the prime Factors of each number
Prime Factors of 63: 63 = 3 x 3 x 7 = 3² x 7
Prime Factors of 49: 49 = 7 x 7 = 7²
Step 2: Now, identify the common prime factors The common prime factor is: 7
Step 3: Multiply the common prime factors 7 = 7. The Greatest Common Factor of 63 and 49 is 7.
GCF of 63 and 49 Using Division Method or Euclidean Algorithm Method
Find the GCF of 63 and 49 using the division method or Euclidean Algorithm Method. Follow these steps:
Step 1: First, divide the larger number by the smaller number Here, divide 63 by 49 63 ÷ 49 = 1 (quotient),
The remainder is calculated as 63 - (49×1) = 14 The remainder is 14, not zero, so continue the process
Step 2: Now divide the previous divisor (49) by the previous remainder (14) Divide 49 by 14 49 ÷ 14 = 3 (quotient), remainder = 49 - (14×3) = 7 The remainder is 7, not zero, so continue the process
Step 3: Divide 14 by 7 14 ÷ 7 = 2 (quotient), remainder = 14 - (7×2) = 0 The remainder is zero, the divisor will become the GCF. The GCF of 63 and 49 is 7.
Common Mistakes and How to Avoid Them in GCF of 63 and 49
Finding GCF of 63 and 49 looks simple, but students often make mistakes while calculating the GCF. Here are some common mistakes to be avoided by the students.
Mistake 1
Listing Incorrect Factors
Students may sometimes list incorrect factors.
For example, while listing factors of 63, students may mention 5 which is incorrect. To avoid this, students should carefully divide the number and list the factors correctly.
Mistake 2
Choosing the wrong common factor
Students may sometimes select the smallest common factor instead of the largest one. To avoid this confusion, students should list all the common factors and find the greatest one.
Mistake 3
Forgetting to include 1 as a factor
Sometimes students may forget 1 as a common factor of the numbers. However, it does not affect the GCF, but it tells about the incomplete understanding of the factors. Students should include 1 as a factor.
Mistake 4
Using Multiples instead of factors
Students confuse between factors and multiples. In that confusion, sometimes they may write multiples instead of factors. To avoid this confusion, students should know the definitions of multiples and factors clearly.
Mistake 5
Assuming GCF is always an even number
Students may assume that the GCF of two numbers will always be an even number. But it's not true that a GCF can also be an odd number. To avoid this, students should focus on common factors rather than focusing on even and odd numbers.
Greatest Common Factor of 63 and 49 Examples
Problem 1
A baker has 63 chocolate cookies and 49 vanilla cookies. He wants to put them into boxes with the same number of cookies in each box, using the largest possible number of cookies per box. How many cookies will be in each box?
We should find the GCF of 63 and 49 GCF of 63 and 49 is 7.
There are 7 cookies in each box. 63 ÷ 7 = 9 49 ÷ 7 = 7
There will be 9 boxes with chocolate cookies and 7 with vanilla cookies, each having 7 cookies.
Explanation
As the GCF of 63 and 49 is 7, the baker can put 7 cookies in each box.
Now divide 63 and 49 by 7.
There will be 9 boxes with chocolate cookies and 7 with vanilla cookies.
Problem 2
An artist has 63 blue beads and 49 red beads. He wants to create necklaces using the largest possible number of beads per necklace. How many beads will be in each necklace?
GCF of 63 and 49 is 7. So each necklace will have 7 beads.
Explanation
There are 63 blue beads and 49 red beads.
To find the total number of beads in each necklace, we should find the GCF of 63 and 49.
There will be 7 beads in each necklace.
Problem 3
A gardener has 63 meters of wire and 49 meters of rope. He wants to cut both into pieces of equal length, using the longest possible length. What should be the length of each piece?
For calculating the longest equal length, we have to calculate the GCF of 63 and 49.
The GCF of 63 and 49 is 7.
The pieces will be 7 meters long.
Explanation
For calculating the longest length of the wire and rope first, we need to calculate the GCF of 63 and 49, which is 7.
The length of each piece will be 7 meters.
Problem 4
A carpenter has two wooden planks, one 63 cm long and the other 49 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?
The carpenter needs the longest piece of wood. GCF of 63 and 49 is 7.
The longest length of each piece is 7 cm.
Explanation
To find the longest length of each piece of the two wooden planks, 63 cm and 49 cm, respectively, we have to find the GCF of 63 and 49, which is 7 cm.
The longest length of each piece is 7 cm.
Problem 5
If the GCF of 63 and ‘b’ is 7, and the LCM is 441, find ‘b’.
The value of ‘b’ is 49.
Explanation
GCF x LCM = product of the numbers
7 × 441 = 63 × b
3087 = 63b
b = 3087 ÷ 63 = 49
FAQs on the Greatest Common Factor of 63 and 49
1.What is the LCM of 63 and 49?
2.Is 63 divisible by 9?
3.What will be the GCF of any two prime numbers?
4.What is the prime factorization of 49?
5.Are 63 and 49 prime numbers?
6.How can families in United States create number-rich environments to improve GCF of 63 and 49 skills?
7.What are some fun ways kids in United States can practice GCF of 63 and 49 with numbers?
8.What role do numbers and GCF of 63 and 49 play in helping children in United States develop problem-solving skills?
9.How can children in United States use numbers in everyday life to understand GCF of 63 and 49?
Important Glossaries for GCF of 63 and 49
- Factors: Factors are numbers that divide the target number completely. For example, the factors of 14 are 1, 2, 7, and 14.
- Multiple: Multiples are the products we get by multiplying a given number by another. For example, the multiples of 7 are 7, 14, 21, 28, 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 18 are 2 and 3.
- Remainder: The value left after division when the number cannot be divided evenly. For example, when 17 is divided by 5, the remainder is 2 and the quotient is 3.
- LCM: The smallest common multiple of two or more numbers is termed LCM. For example, the LCM of 63 and 49 is 441.
- GCF: The largest factor that commonly divides two or more numbers. For example, the GCF of 63 and 49 is 7, as it is their largest common factor that divides the numbers completely.
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.
