2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions (e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.)

There are 14 videos in this category and 0 videos in 0 subcategories.

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Not Right For WatchKnowLearn
Ages: 8 - 13
4353 Views:
Translating Word Statements to Math Using Addition and Subtraction
From YouTube, produced by Candice Jhu
This video indicates it is for pre-algebra, however this would be good for anyone who is reviewing or learning about putting word problems into statement form. They use humor to teach this concept. They use many different examples to reinforce what i... [more]
Found by Barb in 2.OA.A.1
July 31, 2009 at 08:56 AM
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Not Right For WatchKnowLearn
Ages: 9 - 16
2858 Views:
Subtracting Negative Numbers
From YouTube, produced by Lawrence Perez, Candice Jhu
In this video the instructors subtract negative numbers. They start with addition using a number line they show how to subtract negative numbers. They show this with a few examples. Then they move onto subtracting a negative number. They do some exam... [more]
Found by Barb in 2.OA.A.1
July 31, 2009 at 03:45 PM
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Not Right For WatchKnowLearn
Ages: 7 - 11
2882 Views:
Number Line - Virtual Manipulative
From usu.edu, produced by Utah State University
This virtual manipulative can be used to picture whole number operations: addition, subtraction, multiplication and division, carried out on a number line. There are more instructions on the right side of the Java applet.
May 9, 2010 at 12:20 PM
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Not Right For WatchKnowLearn
Ages: 7 - 12
2684 Views:
Singapore Math: Word Problem With Cookies
From 5min, produced by Sal Khan
Khan Academy Present a word problem with cookies (13:06) Sal Khan uses computer software and different colors for demonstration.
June 7, 2011 at 06:17 PM
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Not Right For WatchKnowLearn
Ages: 5 - 8
2582 Views:
Dividing by 2 by Peter Weatherall
From YouTube
The jumping bean shows how to divide by the number 2 in this simply-animated video. Demonstration is accompanied by a catchy tune.
March 14, 2010 at 04:32 PM
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Not Right For WatchKnowLearn
Ages: 5 - 10
2531 Views:
Subtracting Whole Numbers - Khan Academy
From YouTube, produced by Sal Khan
In this three-minute video, Sal Khan subtracts 42 from 68. Mr. Khan, of Khan Academy, uses computer software (and different colors) for demonstration.
July 18, 2011 at 06:14 PM
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Not Right For WatchKnowLearn
Ages: 7 - 11
2098 Views:
Subtraction Word Problem
From YouTube, produced by Sal Khan
In this five-minute video, Sal Khan solves a word problem with 3-digit numbers. Mr. Khan, of Khan Academy, uses computer software for demonstration.
July 18, 2011 at 06:18 PM
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Not Right For WatchKnowLearn
Ages: 7 - 11
10230 Views:
Using Addition to Check Subtraction
From eduplace.com, produced by Houghton Mifflin
Students will learn to use addition (the opposite of subtraction) to check the answer to a subtraction problem.  If the sum of the addition problem equals the number you subtracted from then the difference is correct. User clicks through the slides. ... [more]
Found by tinag1974 in 2.OA.A.1
May 20, 2010 at 02:52 PM
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Not Right For WatchKnowLearn
Ages: 5 - 8
2404 Views:
counting song- adding 5 + 5 (five bees)
From YouTube, produced by Mr. R.
Mr. R.'s salsa math song about adding double number fact, 5 + 5 = 10 and counting in English and Spanish. See more math resources at http://mathstory.com/
Found by raknyc in 2.OA.A.1
May 19, 2010 at 08:07 AM
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Not Right For WatchKnowLearn
Ages: 8 - 14
3139 Views:
Subtracting Numbers on a Number Line
From YouTube, produced by Lawrence Perez/Candice Jhu
The instructor uses humor to demonstrate how to subtract numbers on a number line. The video features a dual screen, and sometimes a three-part screen for demonstration. (06:23)
March 18, 2010 at 08:40 PM
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