← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 477 · 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. 1.341 + 78 =
  2. 2.281 + 37 =
  3. 3.456 + 89 =
  4. 4.143 + 27 =
  5. 5.326 + 59 =
  6. 6.438 + 69 =
  7. 7.384 + 48 =
  8. 8.192 + 69 =
  9. 9.232 + 38 =
  10. 10.208 + 87 =
  11. 11.324 + 18 =
  12. 12.465 + 38 =
  13. 13.234 + 19 =
  14. 14.230 + 97 =
  15. 15.191 + 49 =
  16. 16.56 + 17 =
  17. 17.27 + 67 =
  18. 18.241 + 48 =
  19. 19.446 + 48 =
  20. 20.416 + 28 =
  21. 21.399 + 69 =
  22. 22.46 + 69 =
  23. 23.233 + 78 =
  24. 24.60 + 18 =
  25. 25.443 + 67 =
  26. 26.93 + 67 =
  27. 27.83 + 27 =
  28. 28.302 + 37 =
  29. 29.44 + 28 =
  30. 30.321 + 17 =
  31. 31.126 + 57 =
  32. 32.444 + 39 =
  33. 33.236 + 89 =
  34. 34.178 + 59 =
  35. 35.236 + 27 =
  36. 36.278 + 48 =
  37. 37.239 + 29 =
  38. 38.115 + 68 =
  39. 39.31 + 48 =
  40. 40.62 + 77 =

Answer key

  1. 419
  2. 318
  3. 545
  4. 170
  5. 385
  6. 507
  7. 432
  8. 261
  9. 270
  10. 295
  11. 342
  12. 503
  13. 253
  14. 327
  15. 240
  16. 73
  17. 94
  18. 289
  19. 494
  20. 444
  21. 468
  22. 115
  23. 311
  24. 78
  25. 510
  26. 160
  27. 110
  28. 339
  29. 72
  30. 338
  31. 183
  32. 483
  33. 325
  34. 237
  35. 263
  36. 326
  37. 268
  38. 183
  39. 79
  40. 139

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