← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 74 · 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. 1.412 + 89 =
  2. 2.480 + 59 =
  3. 3.85 + 79 =
  4. 4.142 + 37 =
  5. 5.453 + 48 =
  6. 6.60 + 38 =
  7. 7.220 + 67 =
  8. 8.400 + 27 =
  9. 9.75 + 17 =
  10. 10.306 + 57 =
  11. 11.126 + 18 =
  12. 12.128 + 69 =
  13. 13.131 + 58 =
  14. 14.494 + 69 =
  15. 15.310 + 97 =
  16. 16.176 + 47 =
  17. 17.384 + 37 =
  18. 18.188 + 28 =
  19. 19.462 + 38 =
  20. 20.207 + 77 =
  21. 21.382 + 79 =
  22. 22.259 + 98 =
  23. 23.84 + 38 =
  24. 24.398 + 67 =
  25. 25.364 + 99 =
  26. 26.370 + 57 =
  27. 27.148 + 47 =
  28. 28.89 + 27 =
  29. 29.487 + 97 =
  30. 30.229 + 57 =
  31. 31.362 + 17 =
  32. 32.499 + 28 =
  33. 33.268 + 59 =
  34. 34.253 + 37 =
  35. 35.441 + 87 =
  36. 36.32 + 57 =
  37. 37.158 + 59 =
  38. 38.267 + 77 =
  39. 39.162 + 37 =
  40. 40.205 + 17 =

Answer key

  1. 501
  2. 539
  3. 164
  4. 179
  5. 501
  6. 98
  7. 287
  8. 427
  9. 92
  10. 363
  11. 144
  12. 197
  13. 189
  14. 563
  15. 407
  16. 223
  17. 421
  18. 216
  19. 500
  20. 284
  21. 461
  22. 357
  23. 122
  24. 465
  25. 463
  26. 427
  27. 195
  28. 116
  29. 584
  30. 286
  31. 379
  32. 527
  33. 327
  34. 290
  35. 528
  36. 89
  37. 217
  38. 344
  39. 199
  40. 222

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