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Large Group (Maria)
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 * 1) Begin by giving every student a white board and giving them this problem: "Melik and Oreoluwa are playing the Trading Game. They have 7 tens and 8 ones. How many squares do they have? Then they roll a 3. Now how many tens and ones do they have? How many squares do they have?" Students write their answers on their boards. Be sure they write how many tens and ones and the total number of squares.
 * 1) Half the group plays Tens Go Fish, the other half plays the Trading Game. Halfway through, they switch.

Small Group (Heidi)
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 * 1) Start by having all students make 23 in groups of tens and ones using cubes. Then begin to play the Trading Game from there.
 * 2) Make a list of Plus-1 facts. Begin by giving a story problem that involves a plus-1 fact and talk about how they know the answer. Do another similar plus-1 story problem. Then ask if they can think of other facts like this, and talk about how these are facts they need to know in a snap.