Question
Paul has 129 mochi balls. He puts 10 mochi balls in each box, except the last box which has fewer than 10 mochi balls. How many more mochi balls does Paul need so that he has exactly 10 mochi balls in each box?
2 m

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Paul has 129 mochi balls. He puts 10 mochi balls in each box, except the last box which has fewer than 10 mochi balls. How many more mochi balls does Paul need so that he has exactly 10 mochi balls in each box?