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+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++北师大版一年级下册第五单元加与减（二）问题探究练习拓展小林小红小青小林小红小青13＋3＝16（个）1613－4＝9（个）小青：小林：9小林小红小青1.大象今年多少岁？12+37=49(岁)答：大象今年49岁。2.小兔今年多少岁？12-7=5(岁)答：小兔今年5岁。3.小鹿比小兔大多少岁？12-5=7(岁)答：小鹿比小兔大7岁。42＋6＝48（颗）47－12＝35（本）小结•小结：•求比一个数多几的数是多少，就用加法来算，多了多少就加上多少。•求比一个数少几的数是多少，就用减法来算，少了几就减几。