Double and Half – A Blundred 738 views January 11, 2016November 7, 2017 Mark WeddellDoubling and Halving (2.00 / 5) 1 votes Loading... Choose Double and Half from main screen. Differentiation available from up to 10 to up to 100. Open Activity Add to Bookmarks Other Suggested Activities Doubling - Mark WeddellDoubling by partitioning then adding together. Choose two or three digit numbers to double. Tripods and bipods - A BlundredInvestigation finding all ways of getting totals using 2s and 3s. Double the DonutsSee how quickly the donuts add up when their number increases by doubling.