To solve $-1.8$ subtract $3.3$ ($-1.8 - 3.3$), you can think of it as moving further left on the number line:

1. Start at $-1.8$ on the number line.
2. Subtract $3.3$, which means moving 3.3 units to the left.

Calculation:

$-1.8 - 3.3 = -5.1$

So, the answer is $-5.1$.

Would you like more details or have any questions?

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Here are 5 related questions:

1. How would you solve $-2.5 - 4.1$?
2. What happens if you add a positive number to a negative number on a number line?
3. How do you subtract a negative number from another negative number?
4. Can you explain the process of subtracting fractions using a number line?
5. What is the result of $-3.7 - 2.3$?

Tip: When subtracting larger numbers from smaller ones, the result will always be more negative.