← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 865 · 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. 1.70 + 28 =
  2. 2.443 + 89 =
  3. 3.366 + 48 =
  4. 4.194 + 79 =
  5. 5.496 + 77 =
  6. 6.294 + 19 =
  7. 7.98 + 79 =
  8. 8.398 + 99 =
  9. 9.178 + 29 =
  10. 10.362 + 47 =
  11. 11.155 + 29 =
  12. 12.399 + 29 =
  13. 13.192 + 49 =
  14. 14.54 + 68 =
  15. 15.151 + 59 =
  16. 16.55 + 79 =
  17. 17.242 + 97 =
  18. 18.106 + 18 =
  19. 19.463 + 48 =
  20. 20.201 + 19 =
  21. 21.417 + 59 =
  22. 22.423 + 37 =
  23. 23.159 + 69 =
  24. 24.141 + 17 =
  25. 25.165 + 28 =
  26. 26.282 + 47 =
  27. 27.489 + 78 =
  28. 28.351 + 37 =
  29. 29.61 + 78 =
  30. 30.96 + 88 =
  31. 31.88 + 28 =
  32. 32.358 + 78 =
  33. 33.110 + 57 =
  34. 34.468 + 49 =
  35. 35.139 + 77 =
  36. 36.325 + 28 =
  37. 37.283 + 79 =
  38. 38.495 + 77 =
  39. 39.57 + 99 =
  40. 40.380 + 27 =

Answer key

  1. 98
  2. 532
  3. 414
  4. 273
  5. 573
  6. 313
  7. 177
  8. 497
  9. 207
  10. 409
  11. 184
  12. 428
  13. 241
  14. 122
  15. 210
  16. 134
  17. 339
  18. 124
  19. 511
  20. 220
  21. 476
  22. 460
  23. 228
  24. 158
  25. 193
  26. 329
  27. 567
  28. 388
  29. 139
  30. 184
  31. 116
  32. 436
  33. 167
  34. 517
  35. 216
  36. 353
  37. 362
  38. 572
  39. 156
  40. 407

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