- $$90 \times 6 = 540$$
- $$900 \times 6 = 5400$$
- $$9000 \times 6 = 54000$$
- $$810 : 9 = 90$$
- $$8100 : 9 = 900$$
- $$81000 : 9 = 9000$$
- $$140 - 9 \times 5 = 140 - 45 = 95$$
- $$150 - 7 \times 8 = 150 - 56 = 94$$
- $$160 - 8 \times 8 = 160 - 64 = 96$$
Ответ: 1) 540; 2) 5400; 3) 54000; 4) 90; 5) 900; 6) 9000; 7) 95; 8) 94; 9) 96.