← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 335 · 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 + 37 =
  2. 2.46 + 99 =
  3. 3.41 + 77 =
  4. 4.328 + 39 =
  5. 5.133 + 79 =
  6. 6.223 + 87 =
  7. 7.216 + 97 =
  8. 8.158 + 48 =
  9. 9.231 + 28 =
  10. 10.94 + 67 =
  11. 11.398 + 39 =
  12. 12.300 + 88 =
  13. 13.162 + 97 =
  14. 14.323 + 77 =
  15. 15.294 + 88 =
  16. 16.467 + 87 =
  17. 17.455 + 28 =
  18. 18.493 + 67 =
  19. 19.131 + 97 =
  20. 20.342 + 19 =
  21. 21.291 + 47 =
  22. 22.230 + 57 =
  23. 23.450 + 68 =
  24. 24.96 + 99 =
  25. 25.335 + 79 =
  26. 26.197 + 58 =
  27. 27.369 + 17 =
  28. 28.318 + 77 =
  29. 29.410 + 87 =
  30. 30.183 + 49 =
  31. 31.392 + 68 =
  32. 32.346 + 68 =
  33. 33.146 + 57 =
  34. 34.371 + 29 =
  35. 35.94 + 78 =
  36. 36.413 + 68 =
  37. 37.76 + 78 =
  38. 38.393 + 47 =
  39. 39.450 + 27 =
  40. 40.180 + 48 =

Answer key

  1. 377
  2. 145
  3. 118
  4. 367
  5. 212
  6. 310
  7. 313
  8. 206
  9. 259
  10. 161
  11. 437
  12. 388
  13. 259
  14. 400
  15. 382
  16. 554
  17. 483
  18. 560
  19. 228
  20. 361
  21. 338
  22. 287
  23. 518
  24. 195
  25. 414
  26. 255
  27. 386
  28. 395
  29. 497
  30. 232
  31. 460
  32. 414
  33. 203
  34. 400
  35. 172
  36. 481
  37. 154
  38. 440
  39. 477
  40. 228

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