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Both the process of calculation and producing a correct result are involved in successful mental arithmetic. But most training in mental arithmetic are focused only on getting results. This is not a comprehensive approach. In addition to generating correct outcomes, one must also focus on the thinking process involved in solving arithmetic problems. This book contains numerous exercises focused on arithmetic in binary and ordinary integers, with hundreds of two-digit, three-digit addition and subtraction arithmetic problems. "Mental Arithmetic Exercises" also includes traditional arithmetic problems, so that students may come to fully grasp all aspects of arithmetic process.

口算，既包括求解过程中的口算成分，又包括结果。许多口算训练仅着眼于得到结果，这是不够的，也是不全面的。我们在编写本套口算训练时，除了要求得出结果外，还充分注重求解思考过程中的口算。本册口算的主要內容是两位数加两位数(十位进位的加与其相对应的减)，含几百几十数的计算，三位数加、减一、两位数(一次进位、一次退位)。本套口算除了有传统的口算形式，还出现了图形算式、空格填数、和相等、差相等的式子等形式，把数的运算与式的运算相结合，进行代数思维的启蒙训练。