If you multiply 7 by 3, what is the result?

When you multiply 7 by 3, you are essentially adding 7 three times. This means you can think of it as:

7 + 7 + 7 = 21.

Alternatively, you can visualize the multiplication as a rectangular array with 7 rows and 3 columns, which also results in a total of 21 units.

Thus, the result of multiplying 7 by 3 is 21, making it the correct answer. This fundamental operation demonstrates the concept of multiplication as repeated addition, helping reinforce the understanding of how numbers combine to form products.