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Add the numbers. 3 + 9 + 7. Hint: can you find a way to make 10?
Add the numbers: three plus nine plus seven. Hint: can you find a way to make 10?
Seven and three makes 10. Now we need to add the nine. 10 plus nine makes 19. We found 10 by adding seven and three, and then we added nine more. 10 and nine make 19.