This resource is based upon the popular idea of a crossword. However instead of using words, numbers are used instead. Clues are given by the yellow boxes in the forms of expressions. Some of the clues involve one step, whereas others involve two steps. Could use sheet with or without calculator depending on ability of the class. What is particularly special about this resource is that by pressing the button on the new worksheet tab you can get an entirely different set of questions. Therefore, this starter is great as a settler activity over a number of lessons, as it’s general structure stays the same whilst the numbers change for each worksheet. Also, it can show progress over time, as students should get quicker and become more confident at answering these starter questions. You also get two diferentiated resources for each worksheet, as both the easier and harder worksheets provided give the same answers, whilst usefully giving different questions allowing differentiation within a class.