The children have been working on column subtraction with exchanging/regrouping. For today's lesson they must explain to our visitor (a crocodile who struggles with Maths) why, we sometimes have to exchange numbers to complete column subtraction!
We would like to see a poster explaining how to solve 84-27 and then 321-119. Why do we cross out the tens digit and move it? I've tried explaining to him but he doesn't understand! Make sure your posters are clear and informative- Maple class may appreciate your help too!