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Do you have any manipulatives like base 10 blocks (blocks for 1's, 10's, 100's)? Start by showing a 2 digit number, like 52, with the blocks. Then have them tell you what the 5 10's blocks equal, and the 2 1's block. Write down 50 = 5*10 and 2 = 2*1 once they correctly identify. Then move on to adding them together (you can show first with the blocks that putting a plus sign between the 2 different types of blocks doesn't change the final number, then move the plus sign to the written form). You can then move onto to 3 digit numbers. Paper money in $100, $10, and $1 form can work this way too. Hope this helps!
I would use place value to teach expanded form to second graders.
61 is 6 tens and 1 one .... 6 tens is 60, 1 one is 1
So, 61 = 60 + 1
Styrofoam cups! Write the digit that the students see on the lip and the corresponding "0s" on the body of the cup and then a "+" sign. They can pull the cups apart to "see" the number in expanded notation. i.e. When the cups are together the students will see 345 (one number per lip of the cup) when they pull the cups apart they see 300 + 40 + 5. You can space the numbers 0-9 around the cup and then the students can twist the cups to make any number and see it in expanded notation.
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