89. 400-208 504-397 109×6 205×4 168×4 168:4 648:6 927:9

Решение:

1. $$400 - 208 = 192$$
2. $$504 - 397 = 107$$
3. $$109 \times 6 = 654$$
4. $$205 \times 4 = 820$$
5. $$168 \times 4 = 672$$
6. $$168 : 4 = 42$$
7. $$648 : 6 = 108$$
8. $$927 : 9 = 103$$