16．口算．
0 157564 157572 157578 157582 157588 157590 157594 157600 157602 157608 157614 157618 157620 157624 157630 157632 157638 157642 157644 157648 157650 157654 157656 157658 157659 157660 157662 157663 157664 157666 157668 157672 157674 157678 157680 157684 157690 157692 157698 157702 157704 157708 157714 157720 157722 157728 157732 157734 157740 157744 157750 157758 199269
| 15.2+2.8= | 50×60= | 9+0.8= | 8.7-0.9= | 6.8-2.7= |
| 99÷11= | 120×60= | 350÷70= | 0÷279= | 19+281×0= |