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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 22 · 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. 1.489 + 17 =
  2. 2.190 + 78 =
  3. 3.81 + 19 =
  4. 4.349 + 28 =
  5. 5.308 + 88 =
  6. 6.143 + 99 =
  7. 7.270 + 57 =
  8. 8.122 + 79 =
  9. 9.301 + 38 =
  10. 10.395 + 77 =
  11. 11.413 + 48 =
  12. 12.46 + 57 =
  13. 13.368 + 48 =
  14. 14.443 + 27 =
  15. 15.139 + 29 =
  16. 16.126 + 98 =
  17. 17.497 + 97 =
  18. 18.497 + 79 =
  19. 19.476 + 69 =
  20. 20.493 + 87 =
  21. 21.118 + 29 =
  22. 22.186 + 87 =
  23. 23.301 + 59 =
  24. 24.309 + 38 =
  25. 25.115 + 87 =
  26. 26.476 + 39 =
  27. 27.74 + 19 =
  28. 28.490 + 97 =
  29. 29.163 + 87 =
  30. 30.316 + 69 =
  31. 31.319 + 97 =
  32. 32.284 + 19 =
  33. 33.327 + 88 =
  34. 34.293 + 67 =
  35. 35.155 + 37 =
  36. 36.409 + 29 =
  37. 37.460 + 19 =
  38. 38.195 + 48 =
  39. 39.233 + 48 =
  40. 40.242 + 37 =

Answer key

  1. 506
  2. 268
  3. 100
  4. 377
  5. 396
  6. 242
  7. 327
  8. 201
  9. 339
  10. 472
  11. 461
  12. 103
  13. 416
  14. 470
  15. 168
  16. 224
  17. 594
  18. 576
  19. 545
  20. 580
  21. 147
  22. 273
  23. 360
  24. 347
  25. 202
  26. 515
  27. 93
  28. 587
  29. 250
  30. 385
  31. 416
  32. 303
  33. 415
  34. 360
  35. 192
  36. 438
  37. 479
  38. 243
  39. 281
  40. 279

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