Standard algorithms used in "The Story of Units"-This video demonstrate the standard algorithms used in the "Story of Units." Note: The standards do not specify which algorithms should be used. This these algorithms were selected because they reinforce the students understanding of the place value units. Any use of algorithms should grow out of place value understanding and not undermine it. (See the excerpt from the Numbers and Operations in Base 10 Progression below)
If you have nice numbers in your problem, a strategy may be the most efficient way to solve the problem. But when it comes to solving messy problems, algorithms are very useful. Algorithms are a set of predefined steps applicable to
a class of problems that gives the correct result in every case when the steps
are carried out correctly.