Source google image: http://downloads.bbc.co.uk/skillswise/maths/ma12pape/images/ma12pape-l1-w-addition-puzzle-2-592×838.jpg
Puzzle addition
Source google image: http://downloads.bbc.co.uk/skillswise/maths/ma12pape/images/ma12pape-l1-w-addition-puzzle-2-592×838.jpg