Question
Find Greatest Common Divisor of 45 and 79, using Euclidean algorithm.
Answer
The GCD of given numbers is 1.
Explanation
Step 1 :
Divide by and get the remainder
The remainder is positive (), so we will continue with division.
Step 2 :
Divide by and get the remainder
The remainder is still positive (), so we will continue with division.
Step 3 :
Divide by and get the remainder
The remainder is still positive (), so we will continue with division.
Step 4 :
Divide by and get the remainder
The remainder is zero => GCD is the last divisor .
We can summarize an algorithm into a following table.
| 79 | : | 45 | = | 1 | remainder ( 34 ) | ||||||
| 45 | : | 34 | = | 1 | remainder ( 11 ) | ||||||
| 34 | : | 11 | = | 3 | remainder ( 1 ) | ||||||
| 11 | : | 1 | = | 11 | remainder ( 0 ) | ||||||
| GCD = 1 | |||||||||||
This solution can be visualized using a Venn diagram.
0,0
45
79
1
3
3
5
79
The GCD equals the product of the numbers at the intersection.
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