This bundle is a digital math activity set for three-digit addition and three-digit subtraction strategies (3-digit addition and 3-digit subtraction with regrouping). The activities come ready-made in Google Slides and Seesaw. It covers both regrouping and non-regrouping problems. The resource aligns with one of the 2nd grade Common Core Math Standards in the Numbers and Operations in Base Ten (2.NBT.7). Topics and strategies covered are base-ten blocks, expanded form, open number line, and the