六年级上册数学分数除法
姓名____________ 成绩 _____________
一、分数乘法的算法：
1、分数与整数相乘，分子与整数相乘的积做 ，分母不变。
2、分数与分数相乘，用分子相乘的积做 ，分母相乘的积做 。
3、分数的化简：分子、分母同时除以它们的 。
4、关于分数乘法的计算：可在乘的过程中约分，也可将积的分子分母约分，提倡在计算过程中约分，这样简便。
5、约分的书写格式：把两个可以约分的数先划去，分别在它们的上下方写出约分后的数。
6、分数的基本性质： 。
二、分数除法的算法
1、分数除法是分数乘法的逆运算，就是已知两个数的积与其中一个因数，求另一个因数的运算。除以一个数是乘以这个数的 ，除以几就是乘以这个数的几分之一。
2、记住两变一不变：除数变倒数，除号变乘号；被除数不变。
（A÷B=A×B的倒数；B≠0）
一、 一个数除以整数。
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"36","dataType":"gif","c":"word/media/image1.png"})
÷7＝ ÷4＝ ÷9＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"36","dataType":"gif","c":"word/media/image4.png"})
÷26＝ ÷51＝ ÷6＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image7.png"})
÷14＝ ÷22＝ 84÷16＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image9.png"})
÷25＝ ÷12＝ 24÷56＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image11.png"})
÷19＝ 2÷45＝ 1.5÷21＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image13.png"})
÷21＝ 3÷18＝ 0.25÷12＝
二、 一个数除以分数。
13÷![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image15.png"})
＝ 48÷＝ 50÷＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image18.png"})
÷＝ ÷＝ ÷＝
15÷![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image10.png"})
＝ 10÷＝ 24÷＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image25.png"})
÷＝ ÷＝ ÷＝
24÷![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image30.png"})
＝ 80÷＝ 100÷4＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image32.png"})
÷＝ ÷＝ 1÷＝
![](https://wkrtcs.bdimg.com/rtcs/image?w=13&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"13","h":"37","dataType":"gif","c":"word/media/image38.png"})
÷＝ ÷＝ ÷3＝
三、分数四则混合运算。
![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image43.png"})
÷× ÷÷ ÷×
![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image49.png"})
×÷ ÷（×） ÷（÷）
÷＋ ＋÷ －÷
（5 －![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image36.png"})
）÷ ÷(－) (＋)÷37
10－![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"37","dataType":"gif","c":"word/media/image63.png"})
÷＋ （0.25－）÷（＋） [1－（＋）]÷
![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"7","h":"36","dataType":"gif","c":"word/media/image19.png"})
＋÷（－） （0.8＋）÷（＋） [3－÷]÷6
四、脱式计算。能简算的要简算。
![](https://wkrtcs.bdimg.com/rtcs/image?w=100&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"100","h":"41","dataType":"wmf","c":"word/media/image75.png","imgOriW":200,"imgOriH":82})
![](https://wkrtcs.bdimg.com/rtcs/image?w=64&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"64","h":"41","dataType":"wmf","c":"word/media/image78.png","imgOriW":128,"imgOriH":82})
![](https://wkrtcs.bdimg.com/rtcs/image?w=77&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"77","h":"41","dataType":"gif","c":"word/media/image81.png"})
12×（![](https://wkrtcs.bdimg.com/rtcs/image?w=16&md5sum=dc3cf8116dac3644bc5b301a99cbb864&sign=bff1bf53de&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=50&ipr={"t":"img","w":"16","h":"41","dataType":"gif","c":"word/media/image84.png"})
＋） 15× ＋×
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