There are 3 activities for a Year 2 class to use column addition to solve a problem. The lower and middle activity requires children to try arranging 2 digit numbers to make the biggest and smallest totals they can find. The higher activity requires 4 numbers to be arranged into a grid with a set of instructions to make a total of less than 100. This includes adding the columns and rows then totalling the answers together. This really challenged my HA and had lots of opportunities to practise column addition.