To break down the decimal **6.40**, you can separate it into its whole number part and its fractional (decimal) part. Here's a step-by-step breakdown:

### 1. **Whole Number Part**:
   The whole number part is **6**. This means there are 6 full units.

### 2. **Decimal Part**:
   The decimal part is **0.40**. This represents a fraction of a whole number. Specifically, **0.40** can be written as:
   \[
   0.40 = \frac{40}{100} = \frac{2}{5}
   \]
   So, **0.40** is equivalent to two-fifths of a whole.

### 3. **Combine the Parts**:
   Combining the whole number part and the decimal part, you can think of **6.40** as:
   \[
   6 + 0.40 = 6 + \frac{2}{5}
   \]
   Hence, **6.40** is the same as **6 and 2/5**.

This breakdown can be useful when dealing with fractions or mixed numbers, especially in calculations.

Would you like more details on any part of this breakdown?

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Here are 5 relative questions:
1. How do you convert other decimals, like 7.25, into fractions?
2. How does the decimal system work in terms of place values?
3. Can you simplify other decimals like 0.75 in fraction form?
4. What are some methods to estimate decimal values in mental math?
5. How can you use decimals in everyday scenarios, such as money or measurements?

**Tip**: When converting decimals to fractions, always simplify the fraction by dividing the numerator and denominator by their greatest common divisor (GCD).

Learn how to break down the decimal 6.40 into its whole number and fractional parts with a detailed explanation. This step-by-step guide covers key concepts in decimals, fractions, and mixed numbers, perfect for students in Grades 4-6.

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