I made this short and sweet powerpoint because subtracting three digit numbers always takes several weeks to teach. I use this to supplement my math curriculum. We've all been there: The internet suddenly decides to not cooperate, or we go to copy a math worksheet and the copier is jammed. Instead, I don't have to have any of those fears. I can easily open this up from my desktop and have problems already typed without me having to think! It also allows students to use their whiteboards and solve the problems whole group, small group, with a partner, or independently. Included in the Powerpoint are common mistakes I've noticed students make, and questions to draw their attention to when regrouping is needed.