การคูณทศนิยม

 $0.1\times0.01$  

 $0.8\times\left(-0.1\right)$  

 $0\times\left(-10.9\right)$  

(-5.4)(100)

 $\left(-1.5\right)\left(-0.2\right)$  

 $\left(-1.2\right)\times0$  

 $1\left(-10.9\right)$  

 $1\times0.01\times\left(-0.01\right)$  

 $\left(-5.7\times8.2\right)+\left(5.7\times1.8\right)$  

 $999.9\times\left(-0.7\right)$