Let's go through each of the questions step-by-step.

Question 1:

Evaluate the following: $25.62 - 2.5 \times 1.3$

First, calculate the multiplication: $2.5 \times 1.3 = 3.25$

Then subtract from 25.62: $25.62 - 3.25 = 22.37$

Answer for Question 1:
$22.37$

Question 2:

Evaluate the following: $6.25 + 0.5 - (2.1)^2$

First, square $2.1$: $2.1^2 = 4.41$

Then perform the addition and subtraction: $6.25 + 0.5 = 6.75$ $6.75 - 4.41 = 2.34$

Answer for Question 2:
$2.34$

Question 3:

Order these numbers from least to greatest: $\frac{6}{11}, 6.34, 6.337$

Let's convert the fraction into a decimal: $\frac{6}{11} \approx 0.5455$

Now we can compare the numbers: $0.5455, 6.34, 6.337$

Answer for Question 3 (ordered from least to greatest): $\frac{6}{11}, 6.34, 6.337$

Question 4:

Order these numbers from least to greatest: $\frac{17}{10}, \sqrt{300}, 17.3, \frac{9}{26}$

Let's approximate the values: $\frac{17}{10} = 1.7, \quad \sqrt{300} \approx 17.32, \quad 17.3, \quad \frac{9}{26} \approx 0.346$

Now, arrange them: $0.346, 1.7, 17.3, 17.32$

Answer for Question 4 (ordered from least to greatest): $\frac{9}{26}, \frac{17}{10}, 17.3, \sqrt{300}$

Let me know if you would like further details or have any questions! Here are a few related questions for further practice:

1. How would you calculate $\sqrt{400}$?
2. What is the result of $8.75 - 3.5 \times 2.1$?
3. How would you simplify the fraction $\frac{9}{20}$ into a decimal?
4. Compare these numbers: $2.5, 2.25, \frac{7}{3}$.
5. How would you calculate the value of $(1.5)^2 + 2.4$?

Tip: When dealing with fractions and decimals, try converting all numbers to the same form (either fractions or decimals) for easier comparison.