Adding and subtracting two-digit number and ones using concrete objects, pictorial representation and mentally.
15-3= Put number 15 (always bigger number in your head, small show using fingers) in your head, then show me 2 fingers. Well done, now it shows ‘-’ sign, which means take away/subtract, it means that we need to count backwards or forwards? Right, backwards. Ok, 15 in your head, let’s fold the two fingers as we count, look at the fingers 14, 13! Yes, where did we stop? 12! YAY