← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 712 · 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. 1.334 + 28 =
  2. 2.222 + 89 =
  3. 3.64 + 19 =
  4. 4.188 + 69 =
  5. 5.27 + 37 =
  6. 6.205 + 99 =
  7. 7.65 + 69 =
  8. 8.331 + 28 =
  9. 9.342 + 78 =
  10. 10.435 + 87 =
  11. 11.436 + 18 =
  12. 12.324 + 77 =
  13. 13.383 + 19 =
  14. 14.89 + 88 =
  15. 15.169 + 68 =
  16. 16.435 + 99 =
  17. 17.483 + 98 =
  18. 18.240 + 59 =
  19. 19.315 + 28 =
  20. 20.369 + 97 =
  21. 21.249 + 59 =
  22. 22.220 + 48 =
  23. 23.186 + 58 =
  24. 24.169 + 79 =
  25. 25.83 + 59 =
  26. 26.283 + 48 =
  27. 27.159 + 58 =
  28. 28.166 + 57 =
  29. 29.183 + 78 =
  30. 30.175 + 79 =
  31. 31.58 + 58 =
  32. 32.466 + 97 =
  33. 33.247 + 28 =
  34. 34.137 + 39 =
  35. 35.311 + 28 =
  36. 36.194 + 98 =
  37. 37.98 + 18 =
  38. 38.350 + 88 =
  39. 39.490 + 97 =
  40. 40.44 + 19 =

Answer key

  1. 362
  2. 311
  3. 83
  4. 257
  5. 64
  6. 304
  7. 134
  8. 359
  9. 420
  10. 522
  11. 454
  12. 401
  13. 402
  14. 177
  15. 237
  16. 534
  17. 581
  18. 299
  19. 343
  20. 466
  21. 308
  22. 268
  23. 244
  24. 248
  25. 142
  26. 331
  27. 217
  28. 223
  29. 261
  30. 254
  31. 116
  32. 563
  33. 275
  34. 176
  35. 339
  36. 292
  37. 116
  38. 438
  39. 587
  40. 63

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