Grade 1 (6-7 yrs) Build Subtraction Skills is a skill building game, designed to help kids improve and perfect their subtraction concepts. This interactive math game consists of several challenging rounds, each progressing in its difficulty level. Kids will learn to subtract single and double digit numbers, complete subtraction sentences and subtract 3 numbers. Kids can challenge and test their subtraction skills as they enjoy hours of endless practice. It is an ideal math game for teaching subtraction to kids of Grade 1.