2.NBT.B.9

Explain why addition and subtraction strategies work, using place value and the properties of operations.

There are 21 videos in this category and 0 videos in 0 subcategories.

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Not Right For WatchKnowLearn
Ages: 7 - 10
6884 Views:
Addition with Regrouping - by StudyJams
From scholastic.com, produced by Scholastic
Sometimes when you add, you have to regroup, or carry, a group of tens.  That is why you need to line up your math problems like a pro.  Learn more about addition and regrouping with this step-by-step, interactive link from StudyJams.  A short, self-... [more]
Found by begamatt in 2.NBT.B.9
June 18, 2011 at 10:32 PM
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Not Right For WatchKnowLearn
Ages: 7 - 11
2434 Views:
Adding and Subtracting Negative Numbers - Khan Academy
From YouTube, produced by Salman Khan
In this nine-minute video, the instructor uses software to review how to add and subtract negative numbers. The instructor also uses a number line. The video is suitable for elementary students. (09:15)
January 27, 2010 at 02:59 AM
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Not Right For WatchKnowLearn
Ages: 7 - 12
4178 Views:
Addition 3 (Introducing Carrying) - Khan Academy
From YouTube, produced by Salman Khan
In this video, the instructor uses the Paint Program to review how to add numbers. He starts with single-digit numbers, moves into two-digit and four-digit numbers, and reviews place value. (08:57)
January 27, 2010 at 02:32 AM
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Not Right For WatchKnowLearn
Ages: 7 - 10
10425 Views:
Subtraction 3: Introduction to Borrowing or Regrouping - Khan Academy
From YouTube, produced by Sal Khan
In this video, the instructor uses a graphics program to review how to subtract numbers and introduces how to re-group or borrow. The instructor also uses a number line. The video is suitable for elementary students. (18:26)
January 27, 2010 at 02:51 AM
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Not Right For WatchKnowLearn
Ages: 6 - 10
4472 Views:
Using Addition to Check a Subtraction Problem with 3 Digits
From eduplace.com, produced by Houghton Mifflin
Students will learn to use addition (the opposite of subtraction) to check the difference.  If the sum of the addition problem equals the number you subtracted from, then the answer is correct.  User clicks through the slides. Uses metacognitive stra... [more]
Found by tinag1974 in 2.NBT.B.9
May 20, 2010 at 03:31 PM
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Not Right For WatchKnowLearn
Ages: 8 - 14
3188 Views:
Alternate Mental Subtraction Method - Khan Academy
From YouTube, produced by Sal Khan
In this video, the instructor explains how he uses mental math to subtract two four-digit numbers. In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. This five-minu... [more]
January 23, 2010 at 03:12 PM
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Not Right For WatchKnowLearn
Ages: 8 - 18
2426 Views:
How to Do Math In Your Head : Quick Math Tricks: Multiplying by 11
From YouTube
In this video, a math tutor explains how to multiply by 11 mentally.  The process is explained step-by-step, and example problems are shown on a white screen. (01:33)
July 30, 2011 at 09:17 AM
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Not Right For WatchKnowLearn
Ages: 7 - 10
4048 Views:
Addition 2 - Khan Academy
From YouTube, produced by Sal Khan
In this video, the instructor uses software to review how to add numbers. He starts with single-digit numbers, then moves into two-digit numbers, and reviews how to use a number line. (12:26)
January 27, 2010 at 02:36 AM
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Not Right For WatchKnowLearn
Ages: 8 - 13
2317 Views:
Why Borrowing Works - Khan Academy
From YouTube, produced by Salman Khan
An explanation of why (not how) borrowing/regrouping works when subtracting numbers. Several examples are worked through on a chalkboard. (08:35)
July 11, 2009 at 09:03 AM
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Not Right For WatchKnowLearn
Ages: 8 - 14
3255 Views:
Addition Techniques
From YouTube, produced by Lawrence Perez
This video indicates it is for pre-algebra, however this would be good for anyone who is reviewing or learning place value. This video has humor, which helps make the lesson fun. Video shows how to use the number line, shows how to use the number lin... [more]
Found by Barb in 2.NBT.B.9
July 31, 2009 at 08:00 AM
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