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 Binary Numbers - Mark WeddellBinary Numbers Toggle the 1s and 0s by clicking on them to reveal dots and… Calculation Checkers - Mark WeddellCalculation Checkers - Mark Weddell Check your calculations quickly with these mobile apps. Tap the… Multiple Madness - Mark WeddellChoose a multiplication table then hit multiples as they move across the screen. 20 secs…