← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 961 · 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. 1.108 + 29 =
  2. 2.397 + 79 =
  3. 3.174 + 49 =
  4. 4.356 + 27 =
  5. 5.144 + 17 =
  6. 6.186 + 77 =
  7. 7.58 + 67 =
  8. 8.157 + 58 =
  9. 9.253 + 99 =
  10. 10.109 + 48 =
  11. 11.412 + 28 =
  12. 12.455 + 88 =
  13. 13.232 + 17 =
  14. 14.47 + 48 =
  15. 15.329 + 47 =
  16. 16.190 + 78 =
  17. 17.430 + 38 =
  18. 18.413 + 57 =
  19. 19.297 + 87 =
  20. 20.288 + 78 =
  21. 21.128 + 29 =
  22. 22.143 + 17 =
  23. 23.460 + 19 =
  24. 24.342 + 57 =
  25. 25.465 + 39 =
  26. 26.181 + 29 =
  27. 27.26 + 77 =
  28. 28.40 + 59 =
  29. 29.368 + 89 =
  30. 30.69 + 97 =
  31. 31.388 + 48 =
  32. 32.268 + 77 =
  33. 33.287 + 78 =
  34. 34.451 + 48 =
  35. 35.209 + 79 =
  36. 36.251 + 87 =
  37. 37.111 + 89 =
  38. 38.260 + 19 =
  39. 39.471 + 27 =
  40. 40.151 + 29 =

Answer key

  1. 137
  2. 476
  3. 223
  4. 383
  5. 161
  6. 263
  7. 125
  8. 215
  9. 352
  10. 157
  11. 440
  12. 543
  13. 249
  14. 95
  15. 376
  16. 268
  17. 468
  18. 470
  19. 384
  20. 366
  21. 157
  22. 160
  23. 479
  24. 399
  25. 504
  26. 210
  27. 103
  28. 99
  29. 457
  30. 166
  31. 436
  32. 345
  33. 365
  34. 499
  35. 288
  36. 338
  37. 200
  38. 279
  39. 498
  40. 180

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