It looks like there's a typo in your equation. The correct calculation for \(5 \times 4\) should be \(20\), not \(21\). So, the correct equation is:

\[ 5 \times 4 = 20 \]

Is there any other specific mathematical problem you need help with, or would you like further details on multiplication?

Here are some related questions you might find interesting:

1. What is the result of \(6 \times 7\)?
2. How does the distributive property work in multiplication?
3. Can you solve \(9 \times 8\) using repeated addition?
4. What is the product of \(12 \times 11\)?
5. How does multiplication of fractions differ from multiplication of whole numbers?
6. What is the square of \(5\)?
7. Can you solve \(15 \times 3\) using the break-apart method?
8. What are some strategies for learning multiplication tables effectively?

**Tip:** When multiplying larger numbers, breaking them down into smaller parts can make the process easier. For example, to multiply \(23 \times 7\), you can break it into \((20 \times 7) + (3 \times 7)\).

Understand how to correctly calculate 5 times 4 with a detailed explanation. This problem covers basic multiplication concepts suitable for elementary school students.

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