Subtraction Equations And Differences Box

The Subtraction Equations and Differences Box holds the printed subtraction facts on one set of slips and their differences on another, so a child draws an equation, works it out and finds the matching answer without asking an adult. Slips are taken one at a time and laid out in rows as they are solved, which turns a long piece of work into something a child can leave and pick up again the next morning. When a pair looks doubtful the subtraction chart settles it, so even the correction happens without an adult leaning over the table. Repeated over weeks, the facts move from being calculated to simply being known. Suited to children from three who already work with the subtraction charts.