Decimal Subtraction Using Grid Models: Subtract 0.7 from Shaded Area Representation

To solve this problem, we'll follow these steps:

• Step 1: Align the decimal numbers $1.6$ and $0.7$ by their decimal points.
• Step 2: Perform the subtraction starting from the rightmost digit.
• Step 3: Record the result.

Now, let's work through each step:
Step 1: Align the numbers:
$\phantom{00}1.6$
$- \phantom{0}0.7$

Step 2: Perform the subtraction:
Subtract $0.7$ from $1.6$, digit by digit.

The whole number column $(1 - 0)$ gives $1$, and the tenths column $(6 - 7)$ requires borrowing:
- Convert $1.6$ to $1.5 + 0.1$ which equals $16 - 7$ in tenths.

Subtracting $7$ from $16$ gives $9$.

Thus, our final result is $0.9$.

Therefore, the solution to the problem is $0.9$.