The deep knowledge

this product can help teachers to test the knowledge of the student after an early course of math about sum and substraction it containt ten paper in each one there is a schudle with numbers and empty field the student count the sum(the substraction) following the arrows in the last three paper the test will be more difficult the student should determine the value of each form The product is not allowed to be sold thanks for buying our project follow our store to be the first who here about our