← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 416 · 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. 1.310 + 38 =
  2. 2.139 + 87 =
  3. 3.140 + 88 =
  4. 4.478 + 18 =
  5. 5.147 + 17 =
  6. 6.79 + 29 =
  7. 7.185 + 87 =
  8. 8.75 + 17 =
  9. 9.44 + 39 =
  10. 10.127 + 78 =
  11. 11.490 + 78 =
  12. 12.363 + 19 =
  13. 13.193 + 78 =
  14. 14.42 + 58 =
  15. 15.33 + 79 =
  16. 16.169 + 97 =
  17. 17.92 + 58 =
  18. 18.25 + 57 =
  19. 19.48 + 27 =
  20. 20.288 + 27 =
  21. 21.233 + 57 =
  22. 22.202 + 48 =
  23. 23.223 + 48 =
  24. 24.494 + 98 =
  25. 25.420 + 27 =
  26. 26.419 + 97 =
  27. 27.278 + 47 =
  28. 28.363 + 17 =
  29. 29.135 + 77 =
  30. 30.66 + 38 =
  31. 31.190 + 89 =
  32. 32.146 + 78 =
  33. 33.443 + 29 =
  34. 34.326 + 37 =
  35. 35.230 + 19 =
  36. 36.335 + 27 =
  37. 37.429 + 89 =
  38. 38.386 + 88 =
  39. 39.411 + 38 =
  40. 40.195 + 28 =

Answer key

  1. 348
  2. 226
  3. 228
  4. 496
  5. 164
  6. 108
  7. 272
  8. 92
  9. 83
  10. 205
  11. 568
  12. 382
  13. 271
  14. 100
  15. 112
  16. 266
  17. 150
  18. 82
  19. 75
  20. 315
  21. 290
  22. 250
  23. 271
  24. 592
  25. 447
  26. 516
  27. 325
  28. 380
  29. 212
  30. 104
  31. 279
  32. 224
  33. 472
  34. 363
  35. 249
  36. 362
  37. 518
  38. 474
  39. 449
  40. 223

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