FirstieMath® Intervention: A 30 week comprehensive and systematic math intervention curriculum. What is FirstieMath™ Intervention? FirstieMath® Intervention is a very versatile math intervention curriculum created by a teacher for teachers! The program is versatile for implementation and varying student levels. You can find success in using this program in your intervention groups, RTI groups, guided math groups, whole-group math, or as a resource for non certified staff members assisting in t