Adding and Subtracting Decimals

Adding and Subtracting Decimals

It's just like adding whole numbers with the traditional algorithm

LINE UP YOUR PLACE VALUES!!!!!!!!!!!!!!!!!!!!!!

• You can use the decimal to keep your place values in line!

• You will NOT always have both a tenths and hundredths place.

• Turn your paper sideways to track the place values.

Multiple Choice

Let's give this a try!

342.7 + 23.49

• 366.19

• 365.56

• 57.76

• 366.29

When you're adding decimals:

• Be sure to line up the decimals

• Be sure to add the tenths to the tenths, and the hundredths to the hundredths

• Remember that ten tenths is one one

Multiple Choice

Let's try another one!

194.5 + 18.76

• 382.1

• 213.26

• 212.81

• 38.21

When you're subtracting decimals:

• Line up your place values!

• Regroup place values if needed!

• Don't forget to check your work!

Multiple Choice

OK... Let's subtract!

756.9 - 62.14 = ?

• 714.5

• 694.84

• 714.84

• 694.76

Remember- Subtracting requires:

• Regrouping place values when necessary

• Checking your answer with addition

• Lining up your place values

Multiple Choice

Last guided attempt!

463.7 - 76.08 = ?

• 393.78

• 413.78

• 387.62

• 387.78