We have started a new maths channel for P6 number work. There will be a link on the side bar to that shortly. Meanwhile please have a look at our latest batch of videos which explain some of the strategies for mental subtraction we have been practising. The main thing with strategies is knowing when to use which strategy. There are more strategies - some are unique, individual and very complex - but these are the ones which we think are the most clear and efficient. Our aim was to also make sure our explanations were clear visually and verbally.