← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 208 · 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. 1.477 + 19 =
  2. 2.40 + 99 =
  3. 3.65 + 99 =
  4. 4.294 + 87 =
  5. 5.67 + 78 =
  6. 6.61 + 77 =
  7. 7.191 + 17 =
  8. 8.232 + 97 =
  9. 9.159 + 27 =
  10. 10.167 + 17 =
  11. 11.302 + 87 =
  12. 12.363 + 47 =
  13. 13.189 + 67 =
  14. 14.329 + 18 =
  15. 15.47 + 58 =
  16. 16.85 + 57 =
  17. 17.171 + 19 =
  18. 18.76 + 69 =
  19. 19.101 + 47 =
  20. 20.491 + 79 =
  21. 21.59 + 99 =
  22. 22.122 + 57 =
  23. 23.170 + 79 =
  24. 24.201 + 37 =
  25. 25.105 + 17 =
  26. 26.404 + 98 =
  27. 27.261 + 77 =
  28. 28.44 + 89 =
  29. 29.438 + 59 =
  30. 30.253 + 77 =
  31. 31.269 + 49 =
  32. 32.142 + 67 =
  33. 33.63 + 57 =
  34. 34.106 + 17 =
  35. 35.218 + 28 =
  36. 36.49 + 27 =
  37. 37.435 + 17 =
  38. 38.380 + 58 =
  39. 39.119 + 17 =
  40. 40.374 + 97 =

Answer key

  1. 496
  2. 139
  3. 164
  4. 381
  5. 145
  6. 138
  7. 208
  8. 329
  9. 186
  10. 184
  11. 389
  12. 410
  13. 256
  14. 347
  15. 105
  16. 142
  17. 190
  18. 145
  19. 148
  20. 570
  21. 158
  22. 179
  23. 249
  24. 238
  25. 122
  26. 502
  27. 338
  28. 133
  29. 497
  30. 330
  31. 318
  32. 209
  33. 120
  34. 123
  35. 246
  36. 76
  37. 452
  38. 438
  39. 136
  40. 471

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