The problem asks to estimate the value of $\frac{8.4 + 5.5}{1.8}$ by rounding each number to 1 significant figure. Let's go step by step:

Step 1: Round each number to 1 significant figure.

• $8.4$ rounds to 8.
• $5.5$ rounds to 6.
• $1.8$ rounds to 2.

Step 2: Perform the calculation using the rounded values.

$\frac{8 + 6}{2} = \frac{14}{2} = 7$

Final Answer:

The estimated value is 7.

Would you like more details on rounding numbers or any other clarification?

Here are 5 related questions to practice:

1. Estimate $\frac{12.6 + 4.9}{2.3}$ by rounding to 1 significant figure.
2. What is the result of $\frac{7.4 + 6.2}{1.5}$ rounded to 1 significant figure?
3. If you round 9.8 to 1 significant figure, what do you get?
4. Estimate the value of $\frac{15.8 + 4.1}{3.2}$ using 1 significant figure rounding.
5. How would you round 2.67 to 1 significant figure?

Tip: When rounding, focus on the first digit that is not zero, and adjust based on the next digit.