Last updated on August 5th, 2025
The GCF (Greatest Common Factor) is the largest number that can divide two or more numbers without leaving any remainder. GCF is used to share items equally, group or arrange items, and schedule events. In this topic, we will learn about the GCF of 5 and 7.
The greatest common factor of 5 and 7 is 1. When 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.
To find the GCF of 5 and 7, a few methods are described below:
Steps to find the GCF of 5 and 7 using the listing of factors:
Step 1: Firstly, list the factors of each number
Factors of 5 = 1, 5.
Factors of 7 = 1, 7.
Step 2: Now, identify the common factors. Common factor of 5 and 7: 1.
Step 3: Choose the largest factor. The largest factor that both numbers have is 1. The GCF of 5 and 7 is 1.
To find the GCF of 5 and 7 using the Prime Factorization Method, follow these steps:
Step 1: Find the prime factors of each number:
Prime Factors of 5: 5 = 5
Prime Factors of 7: 7 = 7
Step 2: Now, identify the common prime factors. There are no common prime factors.
Step 3: The GCF is the highest common factor, which is 1.
Find the GCF of 5 and 7 using the division method or Euclidean Algorithm Method. Follow these steps:
Step 1: First, divide the larger number by the smaller number.
Here, divide 7 by 5 7 ÷ 5 = 1 (quotient), The remainder is calculated as 7 − (5×1) = 2
The remainder is 2, not zero, so continue the process
Step 2: Now divide the previous divisor (5) by the previous remainder (2)
Divide 5 by 2 5 ÷ 2 = 2 (quotient), remainder = 5 − (2×2) = 1
The remainder is 1, so the process continues
Step 3: Now divide the previous divisor (2) by the previous remainder (1)
Divide 2 by 1 2 ÷ 1 = 2 (quotient), remainder = 2 − (1×2) = 0
The remainder is zero, the divisor will become the GCF.
The GCF of 5 and 7 is 1.
Finding the GCF of 5 and 7 looks simple, but students often make mistakes while calculating the GCF. Here are some common mistakes to be avoided by the students.
A gardener has 5 sunflower plants and 7 rose plants. She wants to create equal groups of plants with the same number of each type in each group. How many plants will be in each group?
We should find the GCF of 5 and 7 GCF of 5 and 7 is 1.
There is 1 group.
5 ÷ 1 = 5
7 ÷ 1 = 7
There will be 1 group, with each group containing 5 sunflower plants and 7 rose plants.
As the GCF of 5 and 7 is 1, the gardener can only make 1 group. Each group will have all the plants.
A teacher wants to distribute 5 notebooks and 7 pencils among students in such a way that each student gets the same number and type of items. What is the maximum number of students she can distribute these items to?
GCF of 5 and 7 is 1. So, each student can receive 1 notebook and 1 pencil, meaning the maximum number of students is 1.
Since the GCF of 5 and 7 is 1, the maximum number of students that can equally receive the items is 1.
A baker has 5 chocolate muffins and 7 vanilla muffins. He wants to pack them into boxes such that each box has the same number of chocolate and vanilla muffins. How many muffins will be in each box?
For equal packing, find the GCF of 5 and 7
The GCF of 5 and 7 is 1.
Each box will have 1 chocolate muffin and 1 vanilla muffin.
To pack the muffins equally in boxes, the GCF of 5 and 7 is 1, meaning each box can only contain 1 muffin of each type.
A chef has two different ingredients, one weighing 5 grams and the other weighing 7 grams. He wants to divide them into the longest possible equal portions without leftovers. What should be the weight of each portion?
The chef needs the longest portion GCF of 5 and 7 is 1.
The longest weight of each portion is 1 gram.
To divide the ingredients into the longest possible portions without leftover, the GCF of 5 and 7 is 1, so each portion can weigh 1 gram.
If the GCF of 5 and ‘b’ is 1, and the LCM is 35, find ‘b’.
The value of ‘b’ is 7.
GCF × LCM = product of the numbers
1 × 35 = 5 × b
35 = 5b
b = 35 ÷ 5 = 7
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.
: She loves to read number jokes and games.