Group: Adding and Subtracting Whole Numbers and Decimals

Fill in the blank: When adding and subtracting decimals, the first thing you do is vertically ________ ______ the decimal in each number, so the place value is correctly aligned.

THINK ABOUT IT: I'm reading a word problem, and I notice one of the important numbers has a decimal in it, but the other one doesn't and is just a whole number (EX. 1.2 and 2).

QUESTION: How can I add a decimal to a WHOLE NUMBER, so that it is in the correct place and shows the correct value?

How many total cans of food were collected on Thursday, Friday, and Saturday?

How many more cans were collected on Friday and Saturday than on Monday and Tuesday?

Dell’s family drove to Snyder, Texas, to visit

relatives. When the family left, the car’s

odometer showed 44,569.8 miles. When

they returned home, the odometer read

45,001.5 miles. How many miles did the

family travel?

The height of the Seattle Space Needle,

including the spire, is 184.41 meters. The

height of the building without the spire is

158.12 meters. What is the height, in

meters, of the spire?