分拆.
48×6=
5×215=
945÷9=
723÷5=
解:(1)48×6,
=(40+8)×6,
=40×6+8×6,
=240+48,
=288;
(2)5×215,
=5×(200+15),
=5×200+5×15,
=1000+75,
=1075;
(3)945÷9,
=(900+45)÷9,
=900÷9+45÷9,
=100+5,
=105;
(4)723÷5,
=(700+23)÷5,
=700÷5+23÷5,
=140+4…3,
=144…3.
分析:(1)把48化成40+8,再运用乘法的分配律进行计算,
(2)把215化成200+15,再运用乘法的分配律进行计算,
(3)把945化成900+45,用900除以9加上45除以9即可,
(4)把723化成700+23,用700除以5加上23除以5即可.
点评:此题考查的目的是使学生理解掌握运算定律,并且能够运用运算定律计算.