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Interactive video lesson plan for: Difference between two numbers, subtraction, and "how many more" addition

Activity overview:

The difference between two numbers is their distance; how far apart they are from each other on a number line. We look at this concept, and how it ties in with subtraction and addition. This lesson is meant for 2nd or 3rd grade.

We can always SUBTRACT the two numbers to find their difference. For example, to find the difference of 100 and 3, subtract 100 - 3. The difference is 97.

We can also use this idea to solve subtractions, especially those where the two numbers are fairly close to each other. What is 98 - 95? Think how far apart 98 and 95 are from each other. Just three steps. So, 98 - 95 = 3.

Lastly, the difference between two numbers can also be solved by thinking of "how many more" type of an addition. For example, to find the difference between 7 and 12, think: 7 + ____ = 12, or 7 and how many more makes 12? This ties in with the number line: if you are at 7, how many steps do you need to take to get to 12?

Check out also my other math videos at http://www.mathmammoth.com/videos

Tagged under: difference,2nd grade,3rd grade,number line,difference numbers, ,subtraction,addition

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