What is the remainder when 8,34,215 is divided by 9?

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CorrectNot quiteAnswer D

Correct answer: D

The remainder on dividing by 9 equals the remainder of the digit sum on dividing by 9.
Digit sum = $8 + 3 + 4 + 2 + 1 + 5 = 23$ .
$23 = 9 \times 2 + 5$ , so the remainder is 5.

Worth noting

Stopping at $2 + 3 = 5$ gives the same answer: repeated digit sums work too.

Ten questions from Number System, at your own pace.

Ten questions from Number System, at your own pace.

Explanation