Use addition and subtraction within 100 to solve one and twostep 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.)
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Not Right For WatchKnowLearn
Ages: 8  13
6203 Views:

This video indicates it is for prealgebra, 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...s being taught. Video is good quality and good for all students as review or initial learning of the concept. (7:01)
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July 31, 2009 at 08:56 AM


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Ages: 9  16
4148 Views:

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...ples using the number line and doing the problem at the same time. They then look at how subtracting a negative number is the same as adding a postive number. A few examples are then done. The video is good quality and good for all students as review or initial learning of the concept. (05:54)
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July 31, 2009 at 03:45 PM


Not Right For WatchKnowLearn
Ages: 7  11
4076 Views:

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


Not Right For WatchKnowLearn
Ages: 7  12
4000 Views:

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


Not Right For WatchKnowLearn
Ages: 5  10
3872 Views:

In this threeminute 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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Ages: 5  8
3840 Views:

The jumping bean shows how to divide by the number 2 in this simplyanimated video. Demonstration is accompanied by a catchy tune. (01:34)
March 14, 2010 at 04:32 PM


Not Right For WatchKnowLearn
Ages: 7  11
3431 Views:

In this fiveminute video, Sal Khan solves a word problem with 3digit numbers. Mr. Khan, of Khan Academy, uses computer software for demonstration.
July 18, 2011 at 06:18 PM


Not Right For WatchKnowLearn
Ages: 7  11
12310 Views:

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. ...(Run time = N/A since user clicks through slides at their own pace.)
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May 20, 2010 at 02:52 PM


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Ages: 5  8
3342 Views:

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/
May 19, 2010 at 08:07 AM


Not Right For WatchKnowLearn
Ages: 8  14
4360 Views:

The instructor uses humor to demonstrate how to subtract numbers on a number line. The video features a dual screen, and sometimes a threepart screen for demonstration. (06:23)
March 18, 2010 at 08:40 PM
