The accepted and common method of checking the accuracy of a multiplication product is to invert, or switch, the multiplicand and the multiplier and work the problem from a reverse position.

Question

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This method is commonly known as "checking by division" and involves dividing the product by one of the original factors to ensure the other factor is correct. Switching the order of the factors and multiplying again is also a valid way to check the product.

The Accepted and Common Method of Checking the Accuracy of a Multiplication