← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 242 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.390 + 37 =
  2. 2.498 + 89 =
  3. 3.226 + 38 =
  4. 4.234 + 77 =
  5. 5.481 + 49 =
  6. 6.470 + 57 =
  7. 7.197 + 89 =
  8. 8.49 + 59 =
  9. 9.266 + 79 =
  10. 10.282 + 79 =
  11. 11.258 + 59 =
  12. 12.73 + 37 =
  13. 13.441 + 87 =
  14. 14.252 + 87 =
  15. 15.66 + 87 =
  16. 16.196 + 17 =
  17. 17.436 + 29 =
  18. 18.125 + 59 =
  19. 19.312 + 67 =
  20. 20.345 + 58 =
  21. 21.57 + 87 =
  22. 22.278 + 28 =
  23. 23.207 + 77 =
  24. 24.393 + 27 =
  25. 25.203 + 79 =
  26. 26.307 + 89 =
  27. 27.223 + 79 =
  28. 28.313 + 17 =
  29. 29.294 + 98 =
  30. 30.487 + 28 =
  31. 31.320 + 87 =
  32. 32.426 + 67 =
  33. 33.281 + 88 =
  34. 34.288 + 78 =
  35. 35.174 + 67 =
  36. 36.137 + 98 =
  37. 37.471 + 18 =
  38. 38.340 + 18 =
  39. 39.173 + 78 =
  40. 40.413 + 19 =

Answer key

  1. 427
  2. 587
  3. 264
  4. 311
  5. 530
  6. 527
  7. 286
  8. 108
  9. 345
  10. 361
  11. 317
  12. 110
  13. 528
  14. 339
  15. 153
  16. 213
  17. 465
  18. 184
  19. 379
  20. 403
  21. 144
  22. 306
  23. 284
  24. 420
  25. 282
  26. 396
  27. 302
  28. 330
  29. 392
  30. 515
  31. 407
  32. 493
  33. 369
  34. 366
  35. 241
  36. 235
  37. 489
  38. 358
  39. 251
  40. 432

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths