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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 464 · 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. 1.243 + 27 =
  2. 2.475 + 39 =
  3. 3.320 + 37 =
  4. 4.114 + 98 =
  5. 5.61 + 68 =
  6. 6.61 + 38 =
  7. 7.200 + 28 =
  8. 8.32 + 19 =
  9. 9.446 + 58 =
  10. 10.118 + 18 =
  11. 11.266 + 19 =
  12. 12.301 + 69 =
  13. 13.103 + 27 =
  14. 14.375 + 97 =
  15. 15.46 + 87 =
  16. 16.353 + 19 =
  17. 17.146 + 37 =
  18. 18.179 + 18 =
  19. 19.475 + 48 =
  20. 20.415 + 18 =
  21. 21.253 + 47 =
  22. 22.419 + 19 =
  23. 23.68 + 39 =
  24. 24.435 + 29 =
  25. 25.151 + 59 =
  26. 26.393 + 67 =
  27. 27.92 + 28 =
  28. 28.255 + 29 =
  29. 29.366 + 18 =
  30. 30.138 + 39 =
  31. 31.295 + 37 =
  32. 32.88 + 47 =
  33. 33.42 + 59 =
  34. 34.177 + 77 =
  35. 35.122 + 19 =
  36. 36.96 + 79 =
  37. 37.433 + 69 =
  38. 38.459 + 67 =
  39. 39.484 + 29 =
  40. 40.259 + 27 =

Answer key

  1. 270
  2. 514
  3. 357
  4. 212
  5. 129
  6. 99
  7. 228
  8. 51
  9. 504
  10. 136
  11. 285
  12. 370
  13. 130
  14. 472
  15. 133
  16. 372
  17. 183
  18. 197
  19. 523
  20. 433
  21. 300
  22. 438
  23. 107
  24. 464
  25. 210
  26. 460
  27. 120
  28. 284
  29. 384
  30. 177
  31. 332
  32. 135
  33. 101
  34. 254
  35. 141
  36. 175
  37. 502
  38. 526
  39. 513
  40. 286

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