Introduces the seven symbols and their values, shows how to add and subtract to make numbers. Teaches how the symbols interact and about the bar across the top and the open box that are used for larger numbers. Shows Roman numerals in real life settings: on clocks, in books, and on buildings.

Baseball season has arrived and Mo Jackson is all set to play with his team, the Lions. But Mo always bats last, and he always plays right field-- and no balls ever come to right field. Mo wants to get a home run, but he keeps striking out. His team is losing! Will Mo ever get his chance to help the Lions win?

"An apple floats in a tub of water, but a ball of aluminum foil sinks to the bottom. But wait. If that same ball of foil is flattened out and shaped into a boat, it floats! How can that be? David A. Adler's clear, concise text and Anna Raff's delightful illustrations explain the basic principles of flotation and density in a way that will really sink in"--

"Mo Jackson and his friends are competing in a track meet! Can Mo fun fast enough to win the race?"--

When soccer season starts, Mo, who has been working hard to improve his kicking skills, wonders if he will ever get a chance to show his team what he can do.

"An exploration of the metric system, including centimeters, grams, and liters" --