Placing the Decimal Point in the Product (Example)

The video tutorial addresses Julia's mistake of omitting decimal points in her homework. It introduces the counting digit strategy to correctly place decimal points by counting digits to the right of the decimal in each factor. The tutorial also demonstrates using estimation to verify the accuracy of decimal placement. Two problems are discussed, with the first using counting digits and estimation for verification, and the second highlighting challenges in estimation. The tutorial emphasizes understanding decimal placement through practical strategies and verification methods.

In the first problem, how many digits should be counted to the left to place the decimal point correctly?

• 1 digit

• 4 digits

• 2 digits

• 3 digits

What is the estimated product of four and 3/10 and one and eight tenths?

• 6

• 7

• 8

• 9

In the second problem, where does Julia place the decimal point?

• Between the 4 and 9

• Between the 1 and 4

• Between the 3 and 0

• Between the 7 and 4

What fraction is 49 hundredths close to, according to the estimation strategy?

• 1/3

• 1/2

• 1/4

• 3/4

What is half of three, as used in the estimation strategy for the second problem?

• 1 and 3/10

• 1 and 4/10

• 1 and 6/10

• 1 and 5/10