To arrange the numbers \( 0.55 \), \( -0.95 \), and \( -\frac{2}{5} \) in order from least to greatest, we first convert all the numbers into decimals for easier comparison:

- \( 0.55 \) is already in decimal form.
- \( -0.95 \) is already in decimal form.
- \( -\frac{2}{5} = -0.4 \) in decimal form.

Now, we compare the decimals:

- \( -0.95 \)
- \( -0.4 \)
- \( 0.55 \)

So, the numbers in order from least to greatest are:

\[
-0.95, -0.4, 0.55
\]

Would you like further explanation on comparing decimals or fractions?

Here are 5 questions that might help you explore this topic further:
1. How do you convert a fraction to a decimal?
2. What are some techniques for comparing negative numbers?
3. Why are negative numbers less than positive numbers?
4. How does the number line help in comparing decimals?
5. Can two decimals be equal even if they look different?

**Tip:** When comparing numbers, remember that negative values are always smaller than positive values, and the closer a negative number is to zero, the greater it is.

Learn how to arrange the numbers 0.55, -0.95, and -2/5 in order from least to greatest by converting fractions to decimals and comparing negative and positive numbers. This problem is suitable for students in Grades 5-7 and covers important concepts like number comparison and negative values.

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