1. **Problem:** Subtract 190 from 881 with regrouping. - Subtract units: $1 - 0 = 1$ - Subtract tens: $8 - 9$ can't do, regroup 1 from hundreds: $18 - 9 = 9$ - Hundreds: $7 - 1 = 6$ - **Answer:** 691 2. **Problem:** Subtract 308 from 846 with regrouping. - Units: $6 - 8$ can't do, regroup: $16 - 8 = 8$ - Tens: $3 - 0 = 3$ - Hundreds: $7 - 3 = 4$ - **Answer:** 538 3. **Problem:** Subtract 548 from 857 with regrouping. - Units: $7 - 8$ can't do, regroup: $17 - 8 = 9$ - Tens: $4 - 4 = 0$ - Hundreds: $7 - 5 = 2$ - **Answer:** 309 4. **Problem:** Subtract 158 from 523 with regrouping. - Units: $3 - 8$ can't do, regroup: $13 - 8 = 5$ - Tens: $1 - 5$ can't do, regroup: $11 - 5 = 6$ - Hundreds: $4 - 1 = 3$ - **Answer:** 365 5. **Problem:** Subtract 222 from 714 with regrouping. - Units: $4 - 2 = 2$ - Tens: $1 - 2$ can't do, regroup: $11 - 2 = 9$ - Hundreds: $6 - 2 = 4$ - **Answer:** 492 6. **Problem:** Subtract 137 from 429 with regrouping. - Units: $9 - 7 = 2$ - Tens: $2 - 3$ can't do, regroup: $12 - 3 = 9$ - Hundreds: $3 - 1 = 2$ - **Answer:** 292 7. **Problem:** Subtract 337 from 515 with regrouping. - Units: $5 - 7$ can't do, regroup: $15 - 7 = 8$ - Tens: $0 - 3$ can't do, regroup: $10 - 3 = 7$ - Hundreds: $4 - 3 = 1$ - **Answer:** 178 8. **Problem:** Subtract 311 from 920 with regrouping. - Units: $0 - 1$ can't do, regroup: $10 - 1 = 9$ - Tens: $1 - 1 = 0$ - Hundreds: $8 - 3 = 5$ - **Answer:** 609 9. **Problem:** Subtract 455 from 821 with regrouping. - Units: $1 - 5$ can't do, regroup: $11 - 5 = 6$ - Tens: $1 - 5$ can't do, regroup: $11 - 5 = 6$ - Hundreds: $7 - 4 = 3$ - **Answer:** 366 10. **Problem:** Subtract 404 from 982 with regrouping. - Units: $2 - 4$ can't do, regroup: $12 - 4 = 8$ - Tens: $7 - 0 = 7$ - Hundreds: $9 - 4 = 5$ - **Answer:** 578 11. **Problem:** Subtract 561 from 925 with regrouping. - Units: $5 - 1 = 4$ - Tens: $2 - 6$ can't do, regroup: $12 - 6 = 6$ - Hundreds: $8 - 5 = 3$ - **Answer:** 364 12. **Problem:** Subtract 495 from 631 with regrouping. - Units: $1 - 5$ can't do, regroup: $11 - 5 = 6$ - Tens: $2 - 9$ can't do, regroup: $12 - 9 = 3$ - Hundreds: $5 - 4 = 1$ - **Answer:** 136 13. **Problem:** Subtract 290 from 943 with regrouping. - Units: $3 - 0 = 3$ - Tens: $4 - 9$ can't do, regroup: $14 - 9 = 5$ - Hundreds: $8 - 2 = 6$ - **Answer:** 653 14. **Problem:** Subtract 460 from 620 with regrouping. - Units: $0 - 0 = 0$ - Tens: $2 - 6$ can't do, regroup: $12 - 6 = 6$ - Hundreds: $5 - 4 = 1$ - **Answer:** 160 15. **Problem:** Subtract 354 from 836 with regrouping. - Units: $6 - 4 = 2$ - Tens: $3 - 5$ can't do, regroup: $13 - 5 = 8$ - Hundreds: $7 - 3 = 4$ - **Answer:** 482 16. **Problem:** Subtract 139 from 556 with regrouping. - Units: $6 - 9$ can't do, regroup: $16 - 9 = 7$ - Tens: $4 - 3 = 1$ - Hundreds: $5 - 1 = 4$ - **Answer:** 417 17. **Problem:** Subtract 279 from 595 with regrouping. - Units: $5 - 9$ can't do, regroup: $15 - 9 = 6$ - Tens: $8 - 7 = 1$ - Hundreds: $4 - 2 = 2$ - **Answer:** 316 18. **Problem:** Subtract 492 from 628 with regrouping. - Units: $8 - 2 = 6$ - Tens: $2 - 9$ can't do, regroup: $12 - 9 = 3$ - Hundreds: $5 - 4 = 1$ - **Answer:** 136 19. **Problem:** Subtract 145 from 983 with regrouping. - Units: $3 - 5$ can't do, regroup: $13 - 5 = 8$ - Tens: $7 - 4 = 3$ - Hundreds: $8 - 1 = 7$ - **Answer:** 838 20. **Problem:** Subtract 124 from 330 with regrouping. - Units: $0 - 4$ can't do, regroup: $10 - 4 = 6$ - Tens: $2 - 2 = 0$ - Hundreds: $3 - 1 = 2$ - **Answer:** 206 21. **Problem:** Subtract 288 from 494 with regrouping. - Units: $4 - 8$ can't do, regroup: $14 - 8 = 6$ - Tens: $8 - 8 = 0$ - Hundreds: $4 - 2 = 2$ - **Answer:** 206 22. **Problem:** Subtract 139 from 544 with regrouping. - Units: $4 - 9$ can't do, regroup: $14 - 9 = 5$ - Tens: $3 - 3 = 0$ - Hundreds: $5 - 1 = 4$ - **Answer:** 405 23. **Problem:** Subtract 312 from 841 with regrouping. - Units: $1 - 2$ can't do, regroup: $11 - 2 = 9$ - Tens: $3 - 1 = 2$ - Hundreds: $7 - 3 = 4$ - **Answer:** 529 24. **Problem:** Subtract 196 from 736 with regrouping. - Units: $6 - 6 = 0$ - Tens: $3 - 9$ can't do, regroup: $13 - 9 = 4$ - Hundreds: $6 - 1 = 5$ - **Answer:** 540 25. **Problem:** Subtract 451 from 626 with regrouping. - Units: $6 - 1 = 5$ - Tens: $2 - 5$ can't do, regroup: $12 - 5 = 7$ - Hundreds: $5 - 4 = 1$ - **Answer:** 175