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Course 1, Lesson 3, Unknown Numbers in Addition and Subtraction

Course 1, Lesson 3, Unknown Numbers in Addition and Subtraction

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Author: Hector Soto
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1.Make sense of problems and persevere in solving them. 2.Reason abstractly and quantitatively. 3.Construct viable arguments and critique the reasoning of others. 4.Write expressions that record operations with numbers and with letters standing for numbers. For example, express the calculation Subtract y from 5 as 5 - y.
 

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Tutorial

Instructions

Please click on the link to watch the video and take notes. Then come back to this page and complete the quiz.

http://www.educreations.com/lesson/view/unknown-numbers-in-addition-and-subtraction/23400194/

 

Source: Hector Soto