This is my Triangle Addition, Thinkboard, Presentation #1 & 2 for week 4. Phew! It wasn't that hard for me, as we had been learning about ratios the entire week, and subtracting decimals the week before.
Adding was a breeze, but the place value caused a small bump for me; I almost put a number in the wrong position! I hope you enjoy going through my work for week 4.