640 multiplied by 21 is 13440

Explanation: Multiplication is repeated addition. So, 640 × 21 means adding 640, 21 times:

Word Problem Style

If you have 21 boxes and each box contains 640 apples, then the total number of apples is 13440.

Quick Facts

• 640 is called the multiplicand.
• 21 is called the multiplier.
• The result, 13440, is called the product.

Multiplication Table for 640

Explore More Multiplications

• 640 × 22
• 640 × 23
• 640 × 24
• 640 × 25
• 640 × 26
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• 642 × 21
• 643 × 21
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• 645 × 21