To multiply the decimal 0.21 by 740, follow these steps:

1. **Ignore the decimal point** and multiply the numbers as if they were whole numbers:
   \[
   21 \times 740
   \]

2. **Perform the multiplication**:
   \[
   21 \times 740 = 15540
   \]

3. **Reintroduce the decimal point**. Since 0.21 has two decimal places, the result must also have two decimal places:
   \[
   15540 \rightarrow 155.40
   \]

Therefore, the product of 0.21 and 740 is \( 155.40 \).

Would you like further details or have any questions?

Here are some related questions to consider:

1. How do you multiply two decimals together?
2. How does multiplying by a power of ten affect the placement of the decimal?
3. What is the process for dividing decimals?
4. How do you add and subtract decimals?
5. What is the significance of significant figures in multiplication and division?
6. How do you convert a decimal to a fraction?
7. How do you round decimals to a specified number of decimal places?
8. What are some real-world applications of decimal multiplication?

**Tip:** When multiplying decimals, always count the total number of decimal places in both numbers to place the decimal correctly in the final product.

Discover how to multiply the decimal 0.21 by 740 with a detailed step-by-step guide. This problem covers the concept of decimal multiplication, suitable for students in Grades 4-6.

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