CK-12 Foundation
Ck 12: Elem Math: Adding and Subtracting Decimals Word Problems
[Free Registration/Login may be required to access all resource tools.] This is a video that shows how to solve both an addition and subtraction problem with decimals.
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Decimals of Different Signs
This video shows how to add positive and negative money amounts in the context of a word problem using a number line. Practice problems are available. [3:15]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Estimation With Decimals
This video shows how to estimate decimal addition in the context of a word problem. Practice problems are available. [3:01]
Khan Academy
Khan Academy: Estimating and Rounding With Decimals: Estimation With Decimals
This video shows how to estimate decimal addition in the context of a word problem.