This is a power point that walks children through how to solve missing number pyramids in very simple steps, but has calculations that are a little more difficult than the most basic. (It goes beyond facts within 20, for example, but keeps within 100.) The pyramids themselves are set out at an angle because I created them in Excel - a tip I picked up from another TES user - teaching the children to be familiar with them in this layout, means it can take you seconds to create your own alternative pyramids! I’ve uploaded the spreadsheet so you can do that, if you need more, follow the instructions below: Simply highlight and copy the selection (number) of pyramids you want, then paste them into a new sheet - it will randomly create more with different numbers. I then paste into a document (such as ppt or word) and quickly delete some of the numbers to create missing number pyramids (remembering of course to keep the original for the answers!) You can also change the parameters to make them harder or easier. Anyway, I hope this resource is of some use to you. Happy teaching. I would appreciate you leaving a review. :-)