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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 534 · 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. 1.78 + 29 =
  2. 2.220 + 68 =
  3. 3.214 + 58 =
  4. 4.491 + 89 =
  5. 5.169 + 77 =
  6. 6.230 + 69 =
  7. 7.85 + 39 =
  8. 8.494 + 29 =
  9. 9.94 + 17 =
  10. 10.426 + 49 =
  11. 11.253 + 49 =
  12. 12.335 + 67 =
  13. 13.40 + 57 =
  14. 14.267 + 98 =
  15. 15.72 + 87 =
  16. 16.107 + 37 =
  17. 17.193 + 27 =
  18. 18.173 + 99 =
  19. 19.72 + 78 =
  20. 20.445 + 78 =
  21. 21.157 + 77 =
  22. 22.136 + 57 =
  23. 23.402 + 18 =
  24. 24.308 + 98 =
  25. 25.60 + 87 =
  26. 26.459 + 27 =
  27. 27.385 + 48 =
  28. 28.484 + 37 =
  29. 29.351 + 28 =
  30. 30.288 + 77 =
  31. 31.226 + 27 =
  32. 32.163 + 27 =
  33. 33.314 + 78 =
  34. 34.291 + 38 =
  35. 35.263 + 69 =
  36. 36.377 + 99 =
  37. 37.383 + 18 =
  38. 38.124 + 18 =
  39. 39.382 + 19 =
  40. 40.59 + 88 =

Answer key

  1. 107
  2. 288
  3. 272
  4. 580
  5. 246
  6. 299
  7. 124
  8. 523
  9. 111
  10. 475
  11. 302
  12. 402
  13. 97
  14. 365
  15. 159
  16. 144
  17. 220
  18. 272
  19. 150
  20. 523
  21. 234
  22. 193
  23. 420
  24. 406
  25. 147
  26. 486
  27. 433
  28. 521
  29. 379
  30. 365
  31. 253
  32. 190
  33. 392
  34. 329
  35. 332
  36. 476
  37. 401
  38. 142
  39. 401
  40. 147

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