Missing digit puzzles are a perfect way to challenge Key Stage 2 pupils and help them to achieve maths mastery. Use the puzzles as starter activities, whole class problem solving or for stretching the more able.   The instructions for these puzzles are simple - fill in the gaps in the calculations using each digit provided only once. The puzzles are designed so that there is one solution but thousands of possibilities. They cannot be solved by simply trying all the permutations - there are far too many. Pupils will have to really think about the problems and use their knowledge and understanding of maths to decide which statements to fill in first.   The puzzles will develop and consolidate children's understanding of addition, subtraction, multiplication and division, as well as fractions, decimals, percentages and much more.