← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 798 · 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. 1.306 + 68 =
  2. 2.263 + 58 =
  3. 3.120 + 58 =
  4. 4.401 + 49 =
  5. 5.393 + 88 =
  6. 6.183 + 18 =
  7. 7.285 + 37 =
  8. 8.426 + 49 =
  9. 9.352 + 38 =
  10. 10.117 + 87 =
  11. 11.322 + 59 =
  12. 12.224 + 47 =
  13. 13.132 + 47 =
  14. 14.157 + 28 =
  15. 15.74 + 38 =
  16. 16.304 + 67 =
  17. 17.186 + 18 =
  18. 18.478 + 79 =
  19. 19.117 + 98 =
  20. 20.265 + 98 =
  21. 21.218 + 27 =
  22. 22.347 + 49 =
  23. 23.87 + 48 =
  24. 24.152 + 89 =
  25. 25.64 + 39 =
  26. 26.100 + 18 =
  27. 27.71 + 17 =
  28. 28.233 + 47 =
  29. 29.121 + 28 =
  30. 30.121 + 58 =
  31. 31.140 + 18 =
  32. 32.386 + 78 =
  33. 33.274 + 68 =
  34. 34.143 + 17 =
  35. 35.224 + 17 =
  36. 36.226 + 89 =
  37. 37.360 + 77 =
  38. 38.95 + 68 =
  39. 39.284 + 28 =
  40. 40.235 + 19 =

Answer key

  1. 374
  2. 321
  3. 178
  4. 450
  5. 481
  6. 201
  7. 322
  8. 475
  9. 390
  10. 204
  11. 381
  12. 271
  13. 179
  14. 185
  15. 112
  16. 371
  17. 204
  18. 557
  19. 215
  20. 363
  21. 245
  22. 396
  23. 135
  24. 241
  25. 103
  26. 118
  27. 88
  28. 280
  29. 149
  30. 179
  31. 158
  32. 464
  33. 342
  34. 160
  35. 241
  36. 315
  37. 437
  38. 163
  39. 312
  40. 254

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