Exercise 1 (age 4): I put 2 peanuts in my hand. I asked him how many peanuts there were. Then I put 1 peanut in my hand and asked him how many. Then I took and asked him how many.
Results: Great! He seemed a little confused at first. I told him there were zero peanuts. To reinforce the idea, I put 1 peanut in one hand and 0 in the other and told him "There is 1 peanut in this hand and 0 peanuts in this hand." He seems to understand the concept of zero very well.
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