Math-Chrono, additions et soustractions

Math-Chrono stimulates the student to challenge himself by solving twenty equations in a given amount of time. The objective is for the student to learn basic additions and subtractions so he can beat his time in the next times math. The child is in competition with himself, which will encourage him to study. Math-Chrono is a practical tool for teaching math, and, as in sports, one must practice often. There is no answer key for this document.