← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 413 · 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. 1.428 + 58 =
  2. 2.90 + 98 =
  3. 3.84 + 79 =
  4. 4.181 + 47 =
  5. 5.335 + 39 =
  6. 6.456 + 29 =
  7. 7.139 + 97 =
  8. 8.391 + 87 =
  9. 9.357 + 49 =
  10. 10.81 + 58 =
  11. 11.202 + 48 =
  12. 12.76 + 28 =
  13. 13.226 + 97 =
  14. 14.141 + 48 =
  15. 15.495 + 17 =
  16. 16.93 + 38 =
  17. 17.209 + 27 =
  18. 18.465 + 87 =
  19. 19.186 + 49 =
  20. 20.69 + 17 =
  21. 21.144 + 69 =
  22. 22.43 + 19 =
  23. 23.87 + 97 =
  24. 24.33 + 98 =
  25. 25.417 + 19 =
  26. 26.379 + 28 =
  27. 27.232 + 37 =
  28. 28.97 + 88 =
  29. 29.78 + 29 =
  30. 30.297 + 18 =
  31. 31.44 + 38 =
  32. 32.385 + 69 =
  33. 33.227 + 19 =
  34. 34.347 + 37 =
  35. 35.460 + 19 =
  36. 36.441 + 79 =
  37. 37.166 + 57 =
  38. 38.169 + 79 =
  39. 39.462 + 79 =
  40. 40.483 + 59 =

Answer key

  1. 486
  2. 188
  3. 163
  4. 228
  5. 374
  6. 485
  7. 236
  8. 478
  9. 406
  10. 139
  11. 250
  12. 104
  13. 323
  14. 189
  15. 512
  16. 131
  17. 236
  18. 552
  19. 235
  20. 86
  21. 213
  22. 62
  23. 184
  24. 131
  25. 436
  26. 407
  27. 269
  28. 185
  29. 107
  30. 315
  31. 82
  32. 454
  33. 246
  34. 384
  35. 479
  36. 520
  37. 223
  38. 248
  39. 541
  40. 542

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