在平时的学习中,同学们经常会遇到求“一共”的数学题,比如:树上有16只鸟,又飞来8只,树上一共有几只鸟?此时你一点儿也不含糊:“题目里有‘一共’就用加法计算,算式是:16+8=24(只)。”好!再来一个:小兰练习写字,已经写了16个,再写多少个字,就一共写30个字?读完题目,你一定“嘿嘿”笑了:“这也是用加法计算:16+30=46(个)。”“不对啦!”“为什么呀?”你不明白, In normal learning, students often encounter “a total ” math problems, such as: the tree has 16 birds and fly 8, a total of a few birds in the tree? At this time you a little Is not ambiguous: “There is a ’total’ in the title is calculated using the addition, the formula is: 16 +8 = 24 (only). ” Good! Another: Xiaolan practice writing, has written 16, A word, to write a total of 30 words? After reading the title, you must “Hey ” laughed: “This is also calculated by addition: 16 +30 = 46 (a). ” “Why??” You do not understand,