Finding the GCD of 70 and 125

Oct 13, 2025 by wbrum.org 133 views

Introduction

In this article, we will explore the concept of the greatest common divisor (GCD) and how it can be used to find the greatest number that divides two given numbers, leaving specific remainders. We will use the numbers 70 and 125 as examples, and we will also explore other numbers that can be used to find the greatest common divisor.

What is the Greatest Common Divisor (GCD)?

The greatest common divisor (GCD) of two numbers is the largest number that divides both numbers without leaving a remainder. In other words, it is the largest number that is a factor of both numbers. The GCD is also known as the highest common factor (HCF).

Finding the GCD of 70 and 125

To find the GCD of 70 and 125, we need to first find the factors of each number. The factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70. The factors of 125 are 1, 5, 25, and 125.

Step 1: Find the Common Factors

The common factors of 70 and 125 are 1 and 5.

Step 2: Find the Greatest Common Factor

The greatest common factor of 70 and 125 is 5.

Finding the Greatest Number Which Divides 70 and 125 Leaving Remainders 5 and 8 Respectively

Now that we have found the GCD of 70 and 125, we need to find the greatest number that divides both numbers, leaving remainders 5 and 8 respectively.

Let's assume that the greatest number is x. Then, we can write the following equations:

70 = xq + 5 125 = xq + 8

where q is the quotient.

Solving the Equations

We can solve the equations by subtracting 5 from the first equation and 8 from the second equation:

65 = xq 117 = xq

Finding the Greatest Common Divisor of 65 and 117

To find the GCD of 65 and 117, we need to find the factors of each number. The factors of 65 are 1, 5, 13, and 65. The factors of 117 are 1, 3, 39, and 117.

Step 1: Find the Common Factors

The common factors of 65 and 117 are 1.

Step 2: Find the Greatest Common Factor

The greatest common factor of 65 and 117 is 1.

Conclusion

The greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively is 13.

Why is 13 the Greatest Number?

13 is the greatest number because it is the largest number that divides both 70 and 125, leaving remainders 5 and 8 respectively.

Why is 65 the Greatest Number?

65 is the greatest number because it is the largest number that divides both 70 and 125, leaving remainders 5 and 8 respectively.

Why is 875 the Greatest Number?

875 is not the greatest number because it does not divide both 70 and 125, leaving remainders 5 and 8 respectively.

Why is 1750 the Greatest Number?

1750 is not the greatest number because it does not divide both 70 and 125, leaving remainders 5 and 8 respectively.

Conclusion

Q: What is the greatest common divisor (GCD) of 70 and 125?

A: The greatest common divisor (GCD) of 70 and 125 is 5.

Q: How do you find the GCD of two numbers?

A: To find the GCD of two numbers, you need to first find the factors of each number. Then, you need to find the common factors of the two numbers. The greatest common factor of the two numbers is the GCD.

Q: What are the factors of 70 and 125?

A: The factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70. The factors of 125 are 1, 5, 25, and 125.

Q: What are the common factors of 70 and 125?

A: The common factors of 70 and 125 are 1 and 5.

Q: What is the greatest common factor of 70 and 125?

A: The greatest common factor of 70 and 125 is 5.

Q: How do you find the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively?

A: To find the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively, you need to first find the GCD of 70 and 125. Then, you need to find the number that divides both 70 and 125, leaving remainders 5 and 8 respectively.

Q: What is the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively?

A: The greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively is 13.

Q: Why is 13 the greatest number?

A: 13 is the greatest number because it is the largest number that divides both 70 and 125, leaving remainders 5 and 8 respectively.

Q: What are the other possible answers to this problem?

A: The other possible answers to this problem are 65 and 875.

Q: Why are 65 and 875 not the greatest numbers?

A: 65 and 875 are not the greatest numbers because they do not divide both 70 and 125, leaving remainders 5 and 8 respectively.

Q: What is the significance of the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively?

A: The greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively is significant because it is the largest number that divides both 70 and 125, leaving remainders 5 and 8 respectively.

Q: How can you apply the concept of the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively in real-life situations?

A: You can apply the concept of the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively in real-life situations such as finding the greatest common divisor of two numbers, finding the number that divides both numbers, leaving remainders, and solving problems that involve the greatest common divisor.

Conclusion

In conclusion, the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively is 13. The concept of the greatest number which divides 70 and 125 leaving remainders 5 and 8 respectively is significant because it is the largest number that divides both 70 and 125, leaving remainders 5 and 8 respectively.