速度追击

in #cn-malaysia5 years ago

将问题融入日常的生活场景,会让孩子对题目很感兴趣。

所以,为了锻炼儿子的画图解题的能力,我也是挺辛苦的,总是要想各种题目来给儿子做。不过,这个过程我也是挺享受的,乐在其中。

每次看到儿子开心的样子,我也很开心,总能感受到生命的奇妙。


今天要利用线段图解这道题:

小宝出门去上学,步行速度是每分钟60米。10分钟后,爸爸发现小宝忘记带书包了,就骑车去送书包,骑车的速度是每分钟160米,请问爸爸要多久才能追上小宝?

还是老规矩,先画图:
image.png

爸爸多走的路程是多少呢?是小宝走了10分钟的路程。所以是:
image.png

在爸爸从出发到追上小宝的这段时间里,爸爸多走了600米,因为骑车速度快,才能多走这么长。

路程差除以速度差,就是所用的时间:
600/(160-60) = 6分钟

所以,爸爸十分钟后就能追上小宝。

检查一下:
6分钟爸爸追上了小宝,小宝总共走了16分钟,路程长度是6016 = 960米;
爸爸走的路程是:160
6 = 960米;
两个人走的路程相同,所以是正确的。

经过我不断地训练,数学已经成了儿子的兴趣,数学应该不会成为他今后的障碍,我还是很欣慰的。


儿子喜欢做这样的题目,他很兴奋地要求我明天送他上学时,让他先走,我过一会再在后面追他。

小孩子就是这样,看什么都能想到游戏,挺好的。

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