If you were a minus sign, you would subtract one number from another. You could subtract food and balloons. In every problem, you would find the difference. What else could you do if you were a minus sign?

Garbage Trucks (Pebble Plus: Mighty Machines)

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Teen Consumer Smarts: Shop, Save, and Steer Clear of S…

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Westward Expansion (Making of America (Raintree))

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Sharks Past and Present (Prehistoric Animals and Their…

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The Inca City Of Cuzco (Places in History)

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What Happened? (Learn to Read, Read to Learn: Science)

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Computer Hacking (Crime Scene Investigations)

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Asteroids, Comets, and Meteorites (First Facts: Solar …

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Drawing Wicked Tyrants (You Can Draw Fantasy Figures)

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If You Were a Minus Sign (Math Fun)

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