Quick Answer

21 × 400

21 × 400 = 8400. To multiply 21 by 400, add 21 to itself 400 times, or use the standard multiplication algorithm. 21 × 400 = 8400.

8400

21 × 400 = 8400

How to Calculate 21 × 400

To multiply 21 by 400, add 21 to itself 400 times, or use the standard multiplication algorithm. 21 × 400 = 8400.

Expression21 × 400

Answer8400

21 × 400 = 8400

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