addition and subtraction

• The danger students who can not even do simple addition and subtraction
  危险的地方还在于，学生们可能甚至不能做简单的加减法。
• Influence of situation complexity on solving addition and subtraction word problem
  解答加减文字题中情境复杂性对问题难度的影响
• The simplification of addition and subtraction of fuzzy numbers and ranking of fuzzy number
  模糊数加减运算的简化及模糊数的排序
• In this class we are going to learn the essence of addition and subtraction of decimals
  我们今天学习小数加、减法的意义及计算法则。
• When we do addition and subtraction of decimals , we should cross out the 0 at the end
  根据小数的性质：小数末尾的0去掉，小数的大小不变。
• Get deeper understanding of the relationships between the parts of addition and subtraction
  使学生掌握加法各部分之间的关系，加深对加法的理解。
• And the addition and subtraction assignment operators to add and remove handlers from the list
  ，以及加法和减法赋值运算符在列表中添加和移除处理程序。
• If we know how the parts are related we can check the answers of addition and subtraction
  加法的验算。从算出的和里减去一个加数，看是不是等于另一个加数。
• The easiest one to remember is that multiplication and division happen before addition and subtraction
  其中，最简单的规则就是乘法和除法在加法和减法之前完成。