Here is a rectangle that has been partitioned into four smaller rectangles.

For each expression, choose the sub-rectangle whose area, in square units, matches the expression.

1. \(3 \boldcdot (0.6)\)

2. \((0.4) \boldcdot 2\)

3. \((0.4) \boldcdot (0.6)\)

4. \(3 \boldcdot 2\)

Here is an area diagram that represents \((3.1) \boldcdot (1.4)\).

1. Find the areas of sub-rectangles A and B.
2. What is the area of the 3.1 by 1.4 rectangle?

Draw an area diagram to find \((0.36) \boldcdot (0.53)\). Label and organize your work so that it can be followed by others.

Find each product. Show your reasoning.

1. \((2.5) \boldcdot (1.4)\)

2. \((0.64) \boldcdot (0.81)\)

Complete the calculations so that each shows the correct sum.