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Addition and subtraction with significant figures | Decimals | Pre-Algebra | Khan Academy
By Khan Academy
This video shows us the rules for adding and subtracting measurements to show our level of accuracy. Note that the rules for addition/subtraction with significant figures are VERY different than the rules for mulitplication/division. Think about which number is the most precise!
01 - Learn Order Of Operations (5th Grade Math)
By Lumos Learning
This is just a few minutes of a complete course. Get all lessons & more subjects at: http://www.MathTutorDVD.com. This lesson teaches how to use the rules of order of operations to solve problems.
Master the Order of Operations (PEMDAS) in Math - [5-7-5]
By Math and Science
Quality Math And Science Videos that feature step-by-step example problems!