Problem Solving In Decimals

You can easily see any problems they are having by checking the alignment of their numbers on the graph paper.

As with whole numbers, sometimes you run into situations where you need to multiply or divide decimals.

Recall that when you multiply a decimal by a power of ten (10, 100, 1,000, etc), the placement of the decimal point in the product will move to the right according to the number of zeros in the power of ten.

For instance, 4.12 Multiplication and division are inverse operations, so you can expect that if you divide a decimal by a power of ten, the decimal point in the quotient will also correspond to the number of zeros in the power of ten.

You can also give students a decimal and ask by what power of ten they should multiply to make it a whole number, for example, decimal: 1.7 (multiply by 10), decimal: 0.08 (multiply by 100), decimal: 0.043 (multiply by 1,000).

Students who have difficulty writing multiplication and division problems neatly and aligned will benefit from writing their solutions on graph paper.

Wrap-Up and Assessment Hints Mental math exercises are helpful in strengthening students' skills with decimals.

Ask students to tell how many decimal places are the product of pairs of decimals, for example, 0.6 0.09 (4 places).

In the cheese factory, they make cheeses in different sizes.

The small cheeses are sold in pieces, and the big ones are packaged in wedges.


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