Decimal Operations

Thursday and Friday we discussed decimal operations.  This is something that the students should be good at because they have been learning decimals since 4th and 5th grade.

Addition and Subtraction

-There is one thing to remember when adding and subtracting decimals:  line up the decimals.  Along with that add zeros as place holders and add or subtract you numbers.

-To multiply decimals you multiply the numbers as though the numbers do not have decimals.  Just line up your numbers and multiply.  To determine where the decimal goes you count the numbers to the right of the decimal in each number in the problem.  The sum is equal to the number of places you move the decimal to the left in your answer.

-To divide decimals you have to make sure your divisor (the number on the outside) is a whole number.  If it is not you move the decimal to the right until it is a whole number.  The number of places you moved the decimal in your divisor you move the decimal in your dividend, the number under the "house."  Once you have moved the decimal in both the divisor and dividend you bring the decimal to the top and divide.

(Images taken from Google Images)