The Equal Addition MethodI made this resource after reading the wonderful Compendium of Mathematical Methods by Jo Morgan.
A tool for modelling subtraction as difference, but also for modelling how you can simplify a subtraction calculation by adjusting both the minuend and the subtrahend by the same amount.
e.g. 67 - 43
Add 3 to both (using your bonds of ten)
70 - 46 ... a much easier calculation in your head.
Things that you can move: