2010年,笔者对某区2300多名三年级学生进行了一次计算能力调查,在解决188×6、824÷4等一位数乘、除三位数的测试中,通过率高达98.21%,而在解决形如75+125×3×4这样的混合运算时,通过率却只有54.29%。张天孝老师领衔的一项跨越15年的大规模调查研究表明,一年级学生在学习20以内进位加法之前,解决36道算式全对的占38.99%,做对30~35道的占40.10%;而当面对“从1~9中选数填空,使 In 2010, the author conducted a survey of computing power of more than 2,300 third-grade students in a certain district. When solving the one-digit multiplication of 188 × 6, 824 ÷ 4 and so on, except for the three-digit test, the passing rate was as high as 98.21% In solving the form such as 75 +125 × 3 × 4 this mixed operation, the pass rate is only 54.29%. A large-scale survey led by Zhang Tianxiao led by a 15-year study showed that first grade students accounted for 38.99% of all 36 formulas and 40.10% of 30-35, before learning the carry-in addition of 20; When faced ”from 1 to 9 in the number of fill in the blank, so