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Ones digit in product of a multiplication

Ones digit of a multiplication, solving a product

This math skill teaches determining the ones digit of a product in a multiplication problem where each letter represents a unique digit. The focus is on understanding that only the ones place affects the resulting ones digit, which can be any even number including zero.

Learn ones digit in product of a multiplication

Teaching Transcript

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If each letter represents a digit from 0 to 9, what might the digit marked with a question mark be?

We know that the question mark is in the ones place, and is the result of multiplying 2 and some digit. Only the ones place multiplication will affect our mystery digit.

Multiplying 2 and any digit gives us all the even numbers as options.

So the mystery digit can be 2, 4, 6, 8, or zero.

Skill Practice

Ones digit of a multiplication, solving a product

Test your understanding of ones digit in product of a multiplication by practicing it! Work through the below exercises to use it in practice.