1. Solve $809 - 87$. Subtracting the digits: $809 - 87 = 722$. 2. Solve $900 - 348$. Calculate step-by-step: $900 - 300 = 600$, then $600 - 48 = 552$. So, $900 - 348 = 552$. 3. Solve $700 - 481$. Calculate step-by-step: $700 - 400 = 300$, then $300 - 81 = 219$. So, $700 - 481 = 219$. 4. Solve $400 - 237$. Calculate step-by-step: $400 - 200 = 200$, then $200 - 37 = 163$. So, $400 - 237 = 163$. 5. Solve $600 - 325$. Calculate step-by-step: $600 - 300 = 300$, then $300 - 25 = 275$. So, $600 - 325 = 275$.