PBS
Science Fundamentals: Chemistry!
Chemical reactions are a part of almost everything in everyday life. A video presentation gives an introduction to chemistry by describing the basics of atomic structure and chemical reactions. Learners discover chemical reactions are...
Khan Academy
Khan Academy: Addition and Subtraction Word Problems: Subtraction Word Problem
Addition and subtraction Word Problems.
Khan Academy
Khan Academy: Addition and Subtraction Word Problems: Gorillas
Learn how to solve addition and subtraction word problems using gorillas and cookies as examples. [5:31]
Khan Academy
Khan Academy: Word Problems Within 20
Watch Sal solve one addition word problem and one subtraction word problem in this video. [3:37]
Khan Academy
Khan Academy: Adding and Subtracting on Number Line Word Problems
Demonstrates how to use a number line to visualize and solve addition and subtraction word problems. [4:27]
Khan Academy
Khan Academy: Length Word Problems
Models how to solve word problems involving metric length. [5:49]
Khan Academy
Khan Academy: Adding and Subtracting on Number Line Word Problems
Watch Sal use a number lines to solve addition and subtraction word problems with numbers less than 100. [4:27]