← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 487 · 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. 1.45 + 78 =
  2. 2.412 + 67 =
  3. 3.199 + 48 =
  4. 4.444 + 79 =
  5. 5.344 + 19 =
  6. 6.227 + 29 =
  7. 7.399 + 59 =
  8. 8.47 + 67 =
  9. 9.77 + 78 =
  10. 10.297 + 87 =
  11. 11.27 + 29 =
  12. 12.474 + 27 =
  13. 13.191 + 78 =
  14. 14.55 + 87 =
  15. 15.347 + 17 =
  16. 16.145 + 69 =
  17. 17.186 + 59 =
  18. 18.429 + 17 =
  19. 19.312 + 57 =
  20. 20.174 + 78 =
  21. 21.179 + 28 =
  22. 22.328 + 29 =
  23. 23.259 + 38 =
  24. 24.213 + 17 =
  25. 25.349 + 28 =
  26. 26.488 + 59 =
  27. 27.284 + 88 =
  28. 28.323 + 89 =
  29. 29.43 + 19 =
  30. 30.62 + 77 =
  31. 31.295 + 88 =
  32. 32.377 + 67 =
  33. 33.346 + 19 =
  34. 34.193 + 69 =
  35. 35.69 + 19 =
  36. 36.454 + 68 =
  37. 37.448 + 28 =
  38. 38.352 + 69 =
  39. 39.353 + 47 =
  40. 40.139 + 18 =

Answer key

  1. 123
  2. 479
  3. 247
  4. 523
  5. 363
  6. 256
  7. 458
  8. 114
  9. 155
  10. 384
  11. 56
  12. 501
  13. 269
  14. 142
  15. 364
  16. 214
  17. 245
  18. 446
  19. 369
  20. 252
  21. 207
  22. 357
  23. 297
  24. 230
  25. 377
  26. 547
  27. 372
  28. 412
  29. 62
  30. 139
  31. 383
  32. 444
  33. 365
  34. 262
  35. 88
  36. 522
  37. 476
  38. 421
  39. 400
  40. 157

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