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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 294 · 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. 1.304 + 79 =
  2. 2.187 + 77 =
  3. 3.158 + 77 =
  4. 4.359 + 17 =
  5. 5.355 + 69 =
  6. 6.118 + 19 =
  7. 7.71 + 17 =
  8. 8.75 + 28 =
  9. 9.372 + 89 =
  10. 10.469 + 57 =
  11. 11.224 + 97 =
  12. 12.93 + 68 =
  13. 13.417 + 99 =
  14. 14.409 + 58 =
  15. 15.227 + 38 =
  16. 16.278 + 58 =
  17. 17.137 + 57 =
  18. 18.86 + 59 =
  19. 19.121 + 18 =
  20. 20.31 + 87 =
  21. 21.161 + 37 =
  22. 22.215 + 48 =
  23. 23.231 + 48 =
  24. 24.238 + 38 =
  25. 25.450 + 87 =
  26. 26.240 + 29 =
  27. 27.106 + 29 =
  28. 28.482 + 97 =
  29. 29.365 + 17 =
  30. 30.150 + 49 =
  31. 31.280 + 99 =
  32. 32.195 + 17 =
  33. 33.454 + 27 =
  34. 34.256 + 79 =
  35. 35.65 + 59 =
  36. 36.236 + 37 =
  37. 37.184 + 67 =
  38. 38.95 + 47 =
  39. 39.246 + 49 =
  40. 40.434 + 47 =

Answer key

  1. 383
  2. 264
  3. 235
  4. 376
  5. 424
  6. 137
  7. 88
  8. 103
  9. 461
  10. 526
  11. 321
  12. 161
  13. 516
  14. 467
  15. 265
  16. 336
  17. 194
  18. 145
  19. 139
  20. 118
  21. 198
  22. 263
  23. 279
  24. 276
  25. 537
  26. 269
  27. 135
  28. 579
  29. 382
  30. 199
  31. 379
  32. 212
  33. 481
  34. 335
  35. 124
  36. 273
  37. 251
  38. 142
  39. 295
  40. 481

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