Lesson 4 returns to the use of estimation, this time to get the first digit in the quotient. In so doing, there is a return to the standard algorithm. Thus, the method is presented multiple times with increasingly difficult problems. The table shows arrows to indicate movement of the decimal place. Two examples also show this movement.
Students are to write a rule for the process and complete three sets of patterns.
The problem set then contains 23 problems for finding products and a few application problems. The next lesson continues multiplication of a decimal by a whole number. The first example illustrates both a grid model and the standard algorithm. The annotation clearly states that students are to place the decimal by finding the total number of decimal places in the factors, even though this is a decimal times a whole number problem. More examples and problems follow.