3rd grade math
posted by Skyla .
3,456 in expanded form? 3 thousand 4 hundred and 56? is this right?

I would write this as
3000 + 400 + 50 + 6
Here is a site that explains it rather well. 
2+5=7

5+4=9 4+5=9 is commutative is this right?

Maths word form standard form and expand form