Vertical Addition – HTU + HTU – Mark Weddell December 14, 2015September 12, 2021 adminAdd & Subtract Add to Bookmarks Vertical addition – Standard column method Step by step Open Other Suggested Activities Doubling - Mark WeddellDoubling by partitioning then adding together. Choose two or three digit numbers to double. Disappearing Tables - Mark WeddellDisappearing Tables Choose one multiplication table and answer repeated questions. Answers are replaced by a… Binary Numbers - Mark WeddellBinary Numbers Toggle the 1s and 0s by clicking on them to reveal dots and…