We "break apart" three-digit numbers - for example, we write 548 as the sum 500 + 40 + 8 (expanded form). Then we also practice this concept backwards, "forming" or "building" numbers from their parts. For example, we write the sum 60 + 800 as the number 860.
Lastly, we solve some simple missing number questions - and even one really puzzling one!
Check out my other math videos at http://www.mathmammoth.com/videos
Tagged under: place ,-digit numbers,expanded form,2nd grade,math,3-digit,number
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