复习分数乘法

两个分数相乘,分子乘分子,分母乘分母.

先将带分数写成假分数.

$= ~\dfrac{8}3 \times \dfrac{8}5$equals, space, start fraction, 8, divided by, 3, end fraction, times, start fraction, 8, divided by, 5, end fraction $\qquad$

把以上假分数写成带分数 $4\dfrac4{15}$4, start fraction, 4, divided by, 15, end fraction .

约分可以使运算中的数字变小,因此在做分数乘法前要先进行约分.

$=\dfrac{\stackrel{1}{\cancel{3}} \times ~1 }{ 10\times \underset{2}{\cancel{6}}} \qquad$equals, start fraction, start cancel, 3, end cancel, start superscript, 1, end superscript, times, space, 1, divided by, 10, times, start cancel, 6, end cancel, start subscript, 2, end subscript, end fraction