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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 423 · 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. 1.349 + 78 =
  2. 2.191 + 17 =
  3. 3.163 + 67 =
  4. 4.107 + 28 =
  5. 5.112 + 38 =
  6. 6.390 + 78 =
  7. 7.101 + 37 =
  8. 8.168 + 69 =
  9. 9.116 + 98 =
  10. 10.491 + 98 =
  11. 11.477 + 38 =
  12. 12.207 + 88 =
  13. 13.222 + 27 =
  14. 14.215 + 37 =
  15. 15.364 + 39 =
  16. 16.221 + 39 =
  17. 17.162 + 88 =
  18. 18.272 + 29 =
  19. 19.189 + 29 =
  20. 20.350 + 68 =
  21. 21.256 + 17 =
  22. 22.119 + 29 =
  23. 23.269 + 48 =
  24. 24.356 + 68 =
  25. 25.345 + 57 =
  26. 26.332 + 49 =
  27. 27.377 + 39 =
  28. 28.205 + 67 =
  29. 29.260 + 17 =
  30. 30.311 + 57 =
  31. 31.336 + 97 =
  32. 32.111 + 87 =
  33. 33.252 + 99 =
  34. 34.493 + 87 =
  35. 35.257 + 29 =
  36. 36.151 + 67 =
  37. 37.285 + 38 =
  38. 38.38 + 49 =
  39. 39.213 + 87 =
  40. 40.201 + 77 =

Answer key

  1. 427
  2. 208
  3. 230
  4. 135
  5. 150
  6. 468
  7. 138
  8. 237
  9. 214
  10. 589
  11. 515
  12. 295
  13. 249
  14. 252
  15. 403
  16. 260
  17. 250
  18. 301
  19. 218
  20. 418
  21. 273
  22. 148
  23. 317
  24. 424
  25. 402
  26. 381
  27. 416
  28. 272
  29. 277
  30. 368
  31. 433
  32. 198
  33. 351
  34. 580
  35. 286
  36. 218
  37. 323
  38. 87
  39. 300
  40. 278

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