A Seussian celebration of simple math concepts--perfect for the 100th Day of School and fans of The Cat in the Hat! The Cat in the Hat spends the 100th Day of School visiting Sally and Dick's classroom to show how some simple tools--including a hundreds chart, ten frame, number line, and 100 silly hats--make it easy and fun to count, add, subtract, multiply, and divide. While this is a natural choice for celebrating the 100th Day of School, The 100 Hats of the Cat in the Hat is perfect for anyone, anytime, who wants to nurture a beginning reader's interest in numbers! Fans of the hit PBS show The Cat in the Hat Knows a Lot About That! will be delighted at this new addition to the Learning Library series.