When The Solvers accidentally drink a shrinking potion, the pint-sized superheroes must learn all about fractions and decimals to mix an antidote and stop supervillain Null Void from taking over the city! Throughout the action-packed narrative, clear, step-by-step instructions and illustrated, superhero-themed examples introduce readers to fractions and decimals and then teach how to add, subtract, multiply and divide them, in a super easy-to-understand way.