← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 875 · 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. 1.65 + 58 =
  2. 2.123 + 27 =
  3. 3.256 + 89 =
  4. 4.308 + 29 =
  5. 5.218 + 19 =
  6. 6.477 + 89 =
  7. 7.129 + 18 =
  8. 8.126 + 57 =
  9. 9.47 + 19 =
  10. 10.359 + 37 =
  11. 11.305 + 88 =
  12. 12.75 + 29 =
  13. 13.408 + 69 =
  14. 14.323 + 47 =
  15. 15.202 + 78 =
  16. 16.492 + 88 =
  17. 17.452 + 37 =
  18. 18.311 + 49 =
  19. 19.270 + 89 =
  20. 20.227 + 59 =
  21. 21.329 + 69 =
  22. 22.150 + 47 =
  23. 23.360 + 19 =
  24. 24.99 + 79 =
  25. 25.330 + 77 =
  26. 26.161 + 37 =
  27. 27.102 + 87 =
  28. 28.196 + 29 =
  29. 29.35 + 28 =
  30. 30.493 + 58 =
  31. 31.157 + 27 =
  32. 32.54 + 18 =
  33. 33.74 + 18 =
  34. 34.449 + 58 =
  35. 35.130 + 58 =
  36. 36.61 + 98 =
  37. 37.45 + 67 =
  38. 38.231 + 99 =
  39. 39.282 + 29 =
  40. 40.188 + 97 =

Answer key

  1. 123
  2. 150
  3. 345
  4. 337
  5. 237
  6. 566
  7. 147
  8. 183
  9. 66
  10. 396
  11. 393
  12. 104
  13. 477
  14. 370
  15. 280
  16. 580
  17. 489
  18. 360
  19. 359
  20. 286
  21. 398
  22. 197
  23. 379
  24. 178
  25. 407
  26. 198
  27. 189
  28. 225
  29. 63
  30. 551
  31. 184
  32. 72
  33. 92
  34. 507
  35. 188
  36. 159
  37. 112
  38. 330
  39. 311
  40. 285

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