Solve the Word Problem

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Look at the model, what strategy do we need to solve the problem?

Subtraction

There are 12 red marbles and blue marbles. There are 4 blue marbles. How many red marbles are there?

There are 8 red marbles

Tony buys 6 books. Dion buys 3 more books than Tony. How many books does Dion buy?

Dion buys 9 books.

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