10．口算下面各题．
0 159643 159651 159657 159661 159667 159669 159673 159679 159681 159687 159693 159697 159699 159703 159709 159711 159717 159721 159723 159727 159729 159733 159735 159737 159738 159739 159741 159742 159743 159745 159747 159751 159753 159757 159759 159763 159769 159771 159777 159781 159783 159787 159793 159799 159801 159807 159811 159813 159819 159823 159829 159837 199269
| 140×5= | 450÷5= | 31×30= | 420×10= |
| 170+130= | 125×8= | 960-60= | 300÷5= |