to add decimals:
-line up the decimal points
-then starting at the farthest place to the right, add the decimal in each place
-if the sum of the digits in a place are greater than nine,regroup the number to the place to its left.
-check the sum by writing each decimal as an equivalent fraction and then adding these numbers or mixed numbers.
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To add the two decimals together
line up the decimals together
You add the two numbers, and divide the result by 2.
You subtract decimals together.
You line up the decimals with the thousandths and put the decimal straight down from where it is and just add with the decimal in the same spot.