Students work with partners to double-shade the grid to find the product of 0.3 times 0.5. The steps are explained clearly and a second product to model is assigned. Practice problems involve matching number sentences to models. Lesson 6 then combines the illustration in a grid with the standard algorithm notation. The annotation notes decimal placement both by estimation and by counting the total number of places in the factors.
More examples follow with annotation.
Ample problems follow including problem solving applications. Lesson 7 covers the situation where extra leading zeros may need to be inserted in the product. The explanation is clear and the example is also shown worked by a calculator. Since it is a money context, the solution is also rounded to the nearest cent. Some of the problems that follow may be worked with calculators.