The Lost Key: A Mystery With Whole Numbers by Melinda Thielbar

At Sifu Faiza's Kung Fu School, kids learn to be strong and fast. They also learn to be smart, cool-headed, and honest. So Joy, Adam, Sam, and Amy are surprised when the key to the school is stolen -- as well as their kung fu gear. Now they'll have to use all kinds of calculations -- addition, subtraction, multiplication, and division -- to figure out the clues, follow the thieves, and find ...

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