← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 282 · 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. 1.262 + 27 =
  2. 2.124 + 79 =
  3. 3.113 + 18 =
  4. 4.229 + 68 =
  5. 5.458 + 88 =
  6. 6.45 + 47 =
  7. 7.255 + 78 =
  8. 8.487 + 87 =
  9. 9.160 + 57 =
  10. 10.56 + 38 =
  11. 11.219 + 17 =
  12. 12.344 + 27 =
  13. 13.125 + 77 =
  14. 14.312 + 58 =
  15. 15.94 + 97 =
  16. 16.396 + 48 =
  17. 17.100 + 37 =
  18. 18.184 + 58 =
  19. 19.424 + 69 =
  20. 20.98 + 97 =
  21. 21.408 + 98 =
  22. 22.115 + 97 =
  23. 23.459 + 87 =
  24. 24.359 + 87 =
  25. 25.414 + 27 =
  26. 26.222 + 18 =
  27. 27.158 + 98 =
  28. 28.415 + 29 =
  29. 29.187 + 48 =
  30. 30.158 + 68 =
  31. 31.319 + 57 =
  32. 32.445 + 37 =
  33. 33.147 + 78 =
  34. 34.478 + 57 =
  35. 35.234 + 68 =
  36. 36.190 + 97 =
  37. 37.408 + 77 =
  38. 38.93 + 18 =
  39. 39.137 + 38 =
  40. 40.39 + 97 =

Answer key

  1. 289
  2. 203
  3. 131
  4. 297
  5. 546
  6. 92
  7. 333
  8. 574
  9. 217
  10. 94
  11. 236
  12. 371
  13. 202
  14. 370
  15. 191
  16. 444
  17. 137
  18. 242
  19. 493
  20. 195
  21. 506
  22. 212
  23. 546
  24. 446
  25. 441
  26. 240
  27. 256
  28. 444
  29. 235
  30. 226
  31. 376
  32. 482
  33. 225
  34. 535
  35. 302
  36. 287
  37. 485
  38. 111
  39. 175
  40. 136

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