Take him to the supermarket every weekends.
Give him $10, let him buy what he want.
He can buy more than 1 things, however, the total should less than $10.
After he take all those thing, let him cal. the total sum of it. And also he should tell you how much the will have (give him) when he give $10 to the salegirl. If all are correct, let him have all those things.
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