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20×12=90×15=24×20=300×6=900÷3=
150÷5=60÷4=450÷45=780×0=

解:20×12=240,90×15=1350,24×20=480,300×6=1800,900÷3=300,
150÷5=30,60÷4=15,450÷45=10,780×0=0.

分析:根据整数乘除法的计算方法进行计算即可.
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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