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Greatest Common Divisor (GCD) of 168 and 63

The greatest common divisor (GCD) of 168 and 63 is 21.

What is the Greatest Common Divisor (GCD)?

The GCD of two integers is the largest positive integer that divides both numbers without leaving a remainder. It is useful in simplifying fractions, finding common factors, and in number theory.

How to Calculate the GCD of 168 and 63?

We use the Euclidean algorithm, which involves the following steps:

  1. Divide the larger number by the smaller number.
  2. Replace the larger number with the smaller number and the smaller number with the remainder from the division.
  3. Repeat this process until the remainder is zero.
  4. The non-zero remainder just before zero is the GCD.

Step-by-Step Euclidean Algorithm

StepCalculation
1 168 ÷ 63 = 2 remainder 42
2 63 ÷ 42 = 1 remainder 21
3 42 ÷ 21 = 2 remainder 0

Examples of GCD Calculations

NumbersGCD
67 and 1131
161 and 1241
159 and 561
198 and 1642
195 and 12015

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