2_1_07

Large Group (Heidi):

 * 1) Introduce the idea of going backward in the Trading Game (subtraction). Begin by solving a story problem about it on paper. Then students may begin to work backwards with their partners if they seem ready.

Small Group (Maria):
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 * 1) Begin by having each student make 31 in groups of tens and ones with cubes. Use place value mats. As they work, ask them, "How many groups of ten do you have? How many cubes do you have? Is that enough to make 31? What do you need to do?"
 * 2) Students play Double Compare in pairs.
 * 3) Play the Trading Game altogether if there is time.