Khan Academy: Adding and Subtracting Decimals: Subtracting Decimals Word Problem

For this adding and subtracting decimals instructional activity, students add and subtract numbers with decimals in word problems. Students complete 12 word problems.

In this video, Sal solves a word problem sent in by a listener with two cyclists riding towards each other over a given time. It is an interesting problem regarding ratios and the relationship between distance, rate, and time. He shows...

This video shows how to add, subtract, and simplify fractions using a pie graph and an infinite blackboard. Once he has established the rule, Sal throws the viewer a curve ball with a fraction subtraction problem that results in a...

A few word problems involving age are presented. Starting with a simple problem and progressing to more complicated word problems, Sal uses a chart to organize the information given in the more complicated problem to solve for the variable.

For most people, solving word problems takes a lot of work. But Sal makes it look simple! Follow along as he unpacks this complicated word problem. He even demonstrates how to answer. Excellent!

Here are some more age word problems. The instructor uses a chart again to organize the information given. He works through the problem but ends the video with a solution that appears erroneous but is correct. The answer seems too large...

This presentation demonstrates how to solve an age word problem. It is worth the time it takes to view it.

Bring interest to your lesson on adding fractions with different signs by using this Khan Academy video. Sal employs a number line to clearly explain how he adds multiple fractions with different signs. This resource could be used as an...

A video on how to add decimals.

Practice solving word problems by adding or subtracting decimal numbers.