← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 441 · 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. 1.236 + 69 =
  2. 2.311 + 38 =
  3. 3.180 + 68 =
  4. 4.318 + 99 =
  5. 5.43 + 68 =
  6. 6.367 + 48 =
  7. 7.37 + 28 =
  8. 8.311 + 97 =
  9. 9.357 + 47 =
  10. 10.388 + 89 =
  11. 11.120 + 29 =
  12. 12.186 + 69 =
  13. 13.89 + 18 =
  14. 14.91 + 58 =
  15. 15.62 + 77 =
  16. 16.316 + 88 =
  17. 17.428 + 68 =
  18. 18.380 + 27 =
  19. 19.424 + 67 =
  20. 20.158 + 39 =
  21. 21.72 + 78 =
  22. 22.85 + 69 =
  23. 23.73 + 79 =
  24. 24.74 + 98 =
  25. 25.118 + 17 =
  26. 26.158 + 58 =
  27. 27.97 + 88 =
  28. 28.112 + 19 =
  29. 29.186 + 18 =
  30. 30.318 + 17 =
  31. 31.25 + 49 =
  32. 32.316 + 19 =
  33. 33.471 + 19 =
  34. 34.413 + 79 =
  35. 35.424 + 57 =
  36. 36.379 + 69 =
  37. 37.86 + 98 =
  38. 38.458 + 99 =
  39. 39.109 + 59 =
  40. 40.76 + 19 =

Answer key

  1. 305
  2. 349
  3. 248
  4. 417
  5. 111
  6. 415
  7. 65
  8. 408
  9. 404
  10. 477
  11. 149
  12. 255
  13. 107
  14. 149
  15. 139
  16. 404
  17. 496
  18. 407
  19. 491
  20. 197
  21. 150
  22. 154
  23. 152
  24. 172
  25. 135
  26. 216
  27. 185
  28. 131
  29. 204
  30. 335
  31. 74
  32. 335
  33. 490
  34. 492
  35. 481
  36. 448
  37. 184
  38. 557
  39. 168
  40. 95

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