Problem Solving In Decimals

Problem Solving In Decimals-46
The bill for the meal is .32—which includes a tax of .64. So if they know how to multiply .64 by 2, the couple can figure out how much they should leave for the tip. Andy just sold his van that averaged 20 miles per gallon of gasoline.

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Multiplying decimals is the same as multiplying whole numbers except for the placement of the decimal point in the answer.

When you multiply decimals, the decimal point is placed in the The result when two numbers are multiplied. product so that the number of decimal places in the product is the sum of the decimal places in the A number that is multiplied by another number or numbers to get a product.

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).

You can drop the zeros on the right once the decimal point has been placed in the product.

If the number of decimal places is greater than the number of digits in the product, you can insert zeros in front of the product.

You can think of this as moving the decimal point in the dividend the same number of places to the right as you move the decimal point in the divisor. Remember that when you divide, you do not count the total number of decimal places in the divisor and dividend.

You change the divisor to a whole number, then move the decimal point in the dividend the same number of places and divide.

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.

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