Berikut adalah artikel tentang 0.4 x 20:

## Multiplying Decimals: 0.4 x 20

This article will explore how to calculate the product of 0.4 and 20.

### Understanding the Problem

We are asked to multiply the decimal 0.4 by the whole number 20. This problem involves multiplying decimals and whole numbers.

### Methods of Calculation

There are a couple of ways to approach this problem:

**1. Converting the decimal to a fraction:**

**Step 1:**Express 0.4 as a fraction. Since 0.4 represents four-tenths, it can be written as 4/10.**Step 2:**Multiply the fraction by 20. (4/10) x 20 = 80/10.**Step 3:**Simplify the fraction by dividing both numerator and denominator by their greatest common factor, which is 10. 80/10 = 8.

**2. Using direct multiplication:**

**Step 1:**Ignore the decimal point in 0.4 for now and multiply 4 by 20. 4 x 20 = 80.**Step 2:**Count the number of decimal places in the original decimal (0.4 has one decimal place).**Step 3:**Place the decimal point in the result (80) so that it has the same number of decimal places as the original decimal. Therefore, 80 becomes 8.0.

### The Answer

Both methods lead to the same answer: **0.4 x 20 = 8**.

### Conclusion

This article demonstrated how to multiply a decimal and a whole number using two different methods. Understanding these methods will help you confidently solve similar problems involving decimals.