← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 492 · 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. 1.387 + 68 =
  2. 2.427 + 28 =
  3. 3.334 + 38 =
  4. 4.133 + 37 =
  5. 5.185 + 57 =
  6. 6.124 + 97 =
  7. 7.240 + 88 =
  8. 8.455 + 78 =
  9. 9.64 + 48 =
  10. 10.237 + 27 =
  11. 11.36 + 59 =
  12. 12.115 + 77 =
  13. 13.452 + 97 =
  14. 14.41 + 39 =
  15. 15.433 + 68 =
  16. 16.140 + 87 =
  17. 17.117 + 18 =
  18. 18.128 + 87 =
  19. 19.289 + 69 =
  20. 20.497 + 79 =
  21. 21.191 + 39 =
  22. 22.430 + 38 =
  23. 23.150 + 48 =
  24. 24.47 + 17 =
  25. 25.56 + 77 =
  26. 26.35 + 38 =
  27. 27.456 + 27 =
  28. 28.152 + 49 =
  29. 29.313 + 77 =
  30. 30.73 + 98 =
  31. 31.393 + 79 =
  32. 32.40 + 37 =
  33. 33.87 + 37 =
  34. 34.459 + 87 =
  35. 35.41 + 69 =
  36. 36.159 + 87 =
  37. 37.478 + 68 =
  38. 38.416 + 78 =
  39. 39.306 + 99 =
  40. 40.308 + 17 =

Answer key

  1. 455
  2. 455
  3. 372
  4. 170
  5. 242
  6. 221
  7. 328
  8. 533
  9. 112
  10. 264
  11. 95
  12. 192
  13. 549
  14. 80
  15. 501
  16. 227
  17. 135
  18. 215
  19. 358
  20. 576
  21. 230
  22. 468
  23. 198
  24. 64
  25. 133
  26. 73
  27. 483
  28. 201
  29. 390
  30. 171
  31. 472
  32. 77
  33. 124
  34. 546
  35. 110
  36. 246
  37. 546
  38. 494
  39. 405
  40. 325

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