← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 968 · 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. 1.162 + 39 =
  2. 2.376 + 49 =
  3. 3.431 + 99 =
  4. 4.92 + 69 =
  5. 5.26 + 77 =
  6. 6.380 + 68 =
  7. 7.134 + 58 =
  8. 8.188 + 58 =
  9. 9.339 + 79 =
  10. 10.257 + 37 =
  11. 11.420 + 19 =
  12. 12.341 + 69 =
  13. 13.370 + 67 =
  14. 14.312 + 58 =
  15. 15.100 + 47 =
  16. 16.222 + 77 =
  17. 17.388 + 67 =
  18. 18.342 + 67 =
  19. 19.101 + 17 =
  20. 20.267 + 98 =
  21. 21.31 + 78 =
  22. 22.61 + 68 =
  23. 23.29 + 19 =
  24. 24.494 + 28 =
  25. 25.131 + 48 =
  26. 26.292 + 47 =
  27. 27.224 + 99 =
  28. 28.203 + 47 =
  29. 29.369 + 38 =
  30. 30.95 + 77 =
  31. 31.423 + 77 =
  32. 32.126 + 49 =
  33. 33.487 + 39 =
  34. 34.308 + 98 =
  35. 35.333 + 29 =
  36. 36.105 + 97 =
  37. 37.320 + 58 =
  38. 38.451 + 89 =
  39. 39.281 + 38 =
  40. 40.372 + 37 =

Answer key

  1. 201
  2. 425
  3. 530
  4. 161
  5. 103
  6. 448
  7. 192
  8. 246
  9. 418
  10. 294
  11. 439
  12. 410
  13. 437
  14. 370
  15. 147
  16. 299
  17. 455
  18. 409
  19. 118
  20. 365
  21. 109
  22. 129
  23. 48
  24. 522
  25. 179
  26. 339
  27. 323
  28. 250
  29. 407
  30. 172
  31. 500
  32. 175
  33. 526
  34. 406
  35. 362
  36. 202
  37. 378
  38. 540
  39. 319
  40. 409

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