算术大赛 -- 小学算术速算大战
Design of preschool children. It contains a variety of simple and fun activities, to help children to learn numbers, developing basic math ability to learn and master some basic mathematical operations (addition and subtraction).
Design of preschool children. It contains a variety of simple and fun activities, to help children to learn numbers, developing basic math ability to learn and master some basic mathematical operations (addition and subtraction).