1.

HCF of 231. 396 is

Answer»

Euclid's algorithm:

Step 1. Divide the larger number by the smaller one:396 ÷ 231 = 1 + 165;

Step 2. Divide the smaller number by the above operation's remainder:231 ÷ 165 = 1 + 66;

Step 3. Divide the remainder from the step 1 by the remainder from the step 2:165 ÷ 66 = 2 + 33;

Step 4. Divide the remainder from the step 2 by the remainder from the step 3:66 ÷ 33 = 2 + 0;

At this step, the remainder is zero, so we stop:33 is the number we were looking for, the last remainder that is not zero.

This is the greatest common factor (divisor).

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