2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

There are 12 videos in this category and 0 videos in 0 subcategories.

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Ages: 5 - 11
10834 Views:
Using Fact Families in Addition and Subtraction
From eduplace.com, produced by Houghton Mifflin
Addition and subtraction facts that use the same numbers are related. 6+5 =11 and 11 - 5 = 6 are related facts.  Use related facts to solve problems. User clicks through the slides.
Found by tinag1974 in 2.OA.B.2
May 14, 2010 at 02:04 PM
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Not Right For WatchKnowLearn
Ages: 7 - 12
7912 Views:
Relate Addition and Subtraction - by StudyJams
From scholastic.com, produced by Scholastic
Inverse operations are pairs of mathematical operations, like addition and subtraction, that can undo eachother.  You can learn how to do it by using fact families. This cartoon animation from StudyJams also includes a short, self-checking quiz.
Found by begamatt in 2.OA.B.2
June 18, 2011 at 10:26 PM
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Not Right For WatchKnowLearn
Ages: 8 - 14
6667 Views:
Diffy - Virtual Manipulative
From usu.edu, produced by Utah State University
When Diffy opens, there are four black numbers placed at the corners of a black square. Your first goal is to fill in the four blanks in the blue circles in the middle of each side of the black square. Start with any side of the black square and cli... [more]
May 9, 2010 at 11:11 AM
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Not Right For WatchKnowLearn
Ages: 4 - 7
7327 Views:
Fact Families
From eduplace.com, produced by Houghton Mifflin
Students learn to write fact family problems. Fact families all use the same number.  Using a whole, part, part mat, students use cube trains to write two different addition problems using the same numbers- 2, 8 and 10 (2+8=10, 8+2=10).  For the subt... [more]
Found by tinag1974 in 2.OA.B.2
May 14, 2010 at 01:29 PM
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Not Right For WatchKnowLearn
Ages: 5 - 11
7641 Views:
Using Related Facts to Make a Fact Family
From eduplace.com, produced by Houghton Mifflin
A fact family uses the same three numbers to make addition and subtraction problems such as 7+2=9, 2+7=9, 9-2=7, 9-7=2.
Found by tinag1974 in 2.OA.B.2
May 20, 2010 at 01:59 PM
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Not Right For WatchKnowLearn
Ages: 18 - 18
7592 Views:
Teach Students Math with the Arithmetic Game
From YouTube, produced by Expert Village
Learn how to play and teach this great game for practicing arithmetic with an expert teaching tips in this kids math games video clip.  This game can be played for practicing addition, subtraction, multiplication, or division skills.  This is a fun g... [more]
Found by ronna_37 in 2.OA.B.2
March 3, 2010 at 10:30 PM
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Not Right For WatchKnowLearn
Ages: 3 - 7
7845 Views:
LL Cool J Goes on an Addition Expedition With Elmo
From YouTube, produced by sesame Street.org
In this Sesame Street clip, LL Cool J and Elmo sing the Addition Expedition song. Elmo learns how to "add 'em up."(2:09)
Found by ZG in 2.OA.B.2
July 13, 2009 at 01:35 PM
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Not Right For WatchKnowLearn
Ages: 8 - 16
3669 Views:
Subtraction on a Number Line
From YouTube, produced by MuchoMath
This video indicates it is for pre-algebra, however this would be good for anyone who is reviewing subtraction. In this video they show how to subtract using the number line, this includes negative numbers. They do this using many different examples.... [more]
Found by Barb in 2.OA.B.2
July 31, 2009 at 08:44 AM
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Not Right For WatchKnowLearn
Ages: 5 - 9
2741 Views:
Subtraction 2 - Khan Academy
From YouTube, produced by Salman Khan
In this video, the instructor uses the software to review how to subtract numbers visually. The instructor also uses a number line. The video is suitable for elementary students. (12:32)
January 27, 2010 at 02:48 AM
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Not Right For WatchKnowLearn
Ages: 7 - 12
3987 Views:
Number Families and Word Problems
From discoveryeducation.com, produced by Discovery Education
Learn about subtracting and word problesm.  Number families contain three numbers, two small and one big. Using several different number families, students identify the subtraction and addition facts that can be formed using specific combinations of ... [more]
Found by grazianione in 2.OA.B.2
June 2, 2010 at 12:07 PM
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