← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 257 · 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. 1.340 + 29 =
  2. 2.157 + 27 =
  3. 3.192 + 97 =
  4. 4.491 + 48 =
  5. 5.93 + 17 =
  6. 6.483 + 47 =
  7. 7.365 + 17 =
  8. 8.135 + 38 =
  9. 9.100 + 79 =
  10. 10.106 + 78 =
  11. 11.396 + 98 =
  12. 12.424 + 48 =
  13. 13.299 + 37 =
  14. 14.145 + 79 =
  15. 15.93 + 59 =
  16. 16.449 + 38 =
  17. 17.124 + 47 =
  18. 18.426 + 89 =
  19. 19.206 + 89 =
  20. 20.403 + 48 =
  21. 21.465 + 69 =
  22. 22.213 + 39 =
  23. 23.250 + 97 =
  24. 24.82 + 68 =
  25. 25.85 + 47 =
  26. 26.386 + 67 =
  27. 27.233 + 27 =
  28. 28.412 + 48 =
  29. 29.94 + 89 =
  30. 30.426 + 88 =
  31. 31.408 + 38 =
  32. 32.358 + 29 =
  33. 33.485 + 99 =
  34. 34.93 + 59 =
  35. 35.312 + 18 =
  36. 36.177 + 37 =
  37. 37.420 + 39 =
  38. 38.110 + 77 =
  39. 39.320 + 48 =
  40. 40.328 + 78 =

Answer key

  1. 369
  2. 184
  3. 289
  4. 539
  5. 110
  6. 530
  7. 382
  8. 173
  9. 179
  10. 184
  11. 494
  12. 472
  13. 336
  14. 224
  15. 152
  16. 487
  17. 171
  18. 515
  19. 295
  20. 451
  21. 534
  22. 252
  23. 347
  24. 150
  25. 132
  26. 453
  27. 260
  28. 460
  29. 183
  30. 514
  31. 446
  32. 387
  33. 584
  34. 152
  35. 330
  36. 214
  37. 459
  38. 187
  39. 368
  40. 406

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