Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20.

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Ages: 7 - 12
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 1.OA.B.4
June 18, 2011 at 10:26 PM
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Not Right For WatchKnowLearn
Ages: 4 - 7
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 1.OA.B.4
May 14, 2010 at 01:29 PM
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Not Right For WatchKnowLearn
Ages: 4 - 7
Children's Addition
From YouTube, produced by xoax.net
This children's educational video teaches kids basic addition skills. The concept is presented simply with numbers and picture representations of numbers 0 though 10. (04:06)
Found by grazianione in 1.OA.B.4
March 13, 2010 at 09:26 AM
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