关于排名的链接
http://www.shinewrite.com/17_school.html
关于课程 “095 - Fundamental Mathematical Skills 基本数学技巧” 的链接
http://www.math.wisc.edu/095-fundamental-mathematical-skills
大家看看内容，包括了整数，解方程，分数，小数点，比例，百分比，测量，作图与统计等等。
看来美国名校录取的学生还需要补习中关村二小4年级的知识啊。
Topics covered will include:
Whole numbers
Integers and algebraic expressions
Solving equations
Fractions and mixed numbers
Decimals
Ratio and proportion
Percents
Measurement and geometry
Graph and statistics
Exponents and polynomials
