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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 55 · 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. 1.115 + 37 =
  2. 2.52 + 97 =
  3. 3.28 + 49 =
  4. 4.102 + 78 =
  5. 5.192 + 29 =
  6. 6.413 + 37 =
  7. 7.188 + 99 =
  8. 8.408 + 69 =
  9. 9.179 + 17 =
  10. 10.206 + 57 =
  11. 11.84 + 18 =
  12. 12.258 + 17 =
  13. 13.466 + 28 =
  14. 14.153 + 19 =
  15. 15.189 + 88 =
  16. 16.441 + 78 =
  17. 17.456 + 89 =
  18. 18.438 + 98 =
  19. 19.441 + 68 =
  20. 20.377 + 29 =
  21. 21.103 + 39 =
  22. 22.140 + 29 =
  23. 23.428 + 28 =
  24. 24.351 + 89 =
  25. 25.426 + 78 =
  26. 26.357 + 59 =
  27. 27.432 + 29 =
  28. 28.179 + 17 =
  29. 29.104 + 97 =
  30. 30.380 + 88 =
  31. 31.42 + 68 =
  32. 32.75 + 17 =
  33. 33.188 + 87 =
  34. 34.233 + 59 =
  35. 35.248 + 89 =
  36. 36.293 + 97 =
  37. 37.126 + 89 =
  38. 38.303 + 69 =
  39. 39.54 + 99 =
  40. 40.63 + 67 =

Answer key

  1. 152
  2. 149
  3. 77
  4. 180
  5. 221
  6. 450
  7. 287
  8. 477
  9. 196
  10. 263
  11. 102
  12. 275
  13. 494
  14. 172
  15. 277
  16. 519
  17. 545
  18. 536
  19. 509
  20. 406
  21. 142
  22. 169
  23. 456
  24. 440
  25. 504
  26. 416
  27. 461
  28. 196
  29. 201
  30. 468
  31. 110
  32. 92
  33. 275
  34. 292
  35. 337
  36. 390
  37. 215
  38. 372
  39. 153
  40. 130

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