Mrs. Lopez wants her class to celebrate 100 days of school. But Yoshi, Scott, Nathan, and Maggie didn't hear her right. They thought she said 100 days of cool!Now Mrs. Lopez says that if the four kids can be cool for 100 days in a row, the whole class can have the coolest party ever. Can they come up with 100 ideas? Cool socks . . . cool jokes . . . cool costumes . . . cool hats . . . cool volunteer projects . . . and all the other cool things that can be done with the numbers 1-100 make this the coolest math book around.