← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 122 · 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. 1.311 + 67 =
  2. 2.358 + 68 =
  3. 3.67 + 87 =
  4. 4.265 + 78 =
  5. 5.37 + 69 =
  6. 6.132 + 99 =
  7. 7.72 + 27 =
  8. 8.134 + 38 =
  9. 9.340 + 88 =
  10. 10.117 + 28 =
  11. 11.411 + 47 =
  12. 12.362 + 98 =
  13. 13.96 + 47 =
  14. 14.274 + 27 =
  15. 15.312 + 17 =
  16. 16.135 + 17 =
  17. 17.147 + 19 =
  18. 18.372 + 47 =
  19. 19.452 + 48 =
  20. 20.110 + 17 =
  21. 21.451 + 87 =
  22. 22.334 + 87 =
  23. 23.377 + 29 =
  24. 24.150 + 37 =
  25. 25.323 + 17 =
  26. 26.192 + 87 =
  27. 27.123 + 48 =
  28. 28.56 + 98 =
  29. 29.163 + 87 =
  30. 30.272 + 77 =
  31. 31.41 + 87 =
  32. 32.495 + 88 =
  33. 33.190 + 99 =
  34. 34.58 + 79 =
  35. 35.106 + 29 =
  36. 36.29 + 28 =
  37. 37.59 + 27 =
  38. 38.132 + 29 =
  39. 39.235 + 89 =
  40. 40.392 + 77 =

Answer key

  1. 378
  2. 426
  3. 154
  4. 343
  5. 106
  6. 231
  7. 99
  8. 172
  9. 428
  10. 145
  11. 458
  12. 460
  13. 143
  14. 301
  15. 329
  16. 152
  17. 166
  18. 419
  19. 500
  20. 127
  21. 538
  22. 421
  23. 406
  24. 187
  25. 340
  26. 279
  27. 171
  28. 154
  29. 250
  30. 349
  31. 128
  32. 583
  33. 289
  34. 137
  35. 135
  36. 57
  37. 86
  38. 161
  39. 324
  40. 469

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