The difference between two numbers is their distance or how far apart they are from each other on the number line. We look at this concept, and how it ties in with subtraction and addition.

(Note: the video uses the terminology "difference of" instead of "difference between". It means the same thing.)

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

We can also use this idea to find answers to subtraction problems, especially when 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" , and using addition. For example, to find the difference between 7 and 12, think: 7 + ____ = 12, or "7 and how many more make 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?

The last part of this lesson has a silly word problem about jumping jacks; you can find it here:
   • "How many more" word problem example ...  

This lesson is part of the Math Mammoth Grade 2 curriculum:
https://www.mathmammoth.com/complete/...

Practice the connection/relationship between addition and subtraction with interactive exercises:
https://www.mathmammoth.com/practice/...

Find my other 2nd grade math videos at https://www.mathmammoth.com/videos/gr...