← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 460 · 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. 1.162 + 57 =
  2. 2.437 + 89 =
  3. 3.207 + 87 =
  4. 4.38 + 99 =
  5. 5.55 + 67 =
  6. 6.395 + 69 =
  7. 7.335 + 59 =
  8. 8.35 + 17 =
  9. 9.227 + 29 =
  10. 10.346 + 78 =
  11. 11.42 + 97 =
  12. 12.388 + 37 =
  13. 13.293 + 49 =
  14. 14.51 + 89 =
  15. 15.205 + 68 =
  16. 16.78 + 88 =
  17. 17.32 + 69 =
  18. 18.129 + 37 =
  19. 19.210 + 17 =
  20. 20.395 + 27 =
  21. 21.88 + 38 =
  22. 22.98 + 38 =
  23. 23.331 + 87 =
  24. 24.221 + 89 =
  25. 25.205 + 39 =
  26. 26.229 + 59 =
  27. 27.33 + 17 =
  28. 28.390 + 67 =
  29. 29.317 + 17 =
  30. 30.285 + 18 =
  31. 31.330 + 79 =
  32. 32.268 + 28 =
  33. 33.409 + 17 =
  34. 34.251 + 99 =
  35. 35.303 + 49 =
  36. 36.295 + 48 =
  37. 37.163 + 69 =
  38. 38.343 + 97 =
  39. 39.249 + 99 =
  40. 40.100 + 19 =

Answer key

  1. 219
  2. 526
  3. 294
  4. 137
  5. 122
  6. 464
  7. 394
  8. 52
  9. 256
  10. 424
  11. 139
  12. 425
  13. 342
  14. 140
  15. 273
  16. 166
  17. 101
  18. 166
  19. 227
  20. 422
  21. 126
  22. 136
  23. 418
  24. 310
  25. 244
  26. 288
  27. 50
  28. 457
  29. 334
  30. 303
  31. 409
  32. 296
  33. 426
  34. 350
  35. 352
  36. 343
  37. 232
  38. 440
  39. 348
  40. 119

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