Algebra - One-Step Equations - Treetop Displays - This free set comprises of a range of one-step equations for simple and basic algebra. There are 9 equations for each operation of addition, subtraction, multiplication and division (36 equations in total). Visit our website for more information and for other printable classroom resources by clicking on the provided links. Designed by teachers for Early Years (EYFS), Key Stage 1 (KS1) and Key Stage 2 (KS2).