The Book of FactsSubtraction is a resource book that provides instruction lessons for subtraction, number-fact strategies. This teacher resource is used in conjunction with The Box of Facts that provide ready-made visual models to reinforce students strategy practice.
Each lesson introduces, reinforces, practices, and extends student understanding of the basic subtraction number-fact strategies. ORIGO has chosen strategies that meet three research-based criteria. Each strategy must be effective, efficient, and extendable.
Book of Facts include:
Introduction, reinforcement, practice, and extension activities