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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 697 · 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. 1.482 + 19 =
  2. 2.227 + 77 =
  3. 3.213 + 67 =
  4. 4.78 + 58 =
  5. 5.488 + 67 =
  6. 6.131 + 49 =
  7. 7.71 + 88 =
  8. 8.277 + 37 =
  9. 9.123 + 37 =
  10. 10.107 + 29 =
  11. 11.277 + 49 =
  12. 12.374 + 98 =
  13. 13.341 + 79 =
  14. 14.312 + 27 =
  15. 15.204 + 59 =
  16. 16.217 + 48 =
  17. 17.174 + 97 =
  18. 18.402 + 97 =
  19. 19.159 + 57 =
  20. 20.488 + 98 =
  21. 21.117 + 29 =
  22. 22.340 + 59 =
  23. 23.118 + 87 =
  24. 24.193 + 19 =
  25. 25.57 + 57 =
  26. 26.120 + 77 =
  27. 27.356 + 89 =
  28. 28.72 + 98 =
  29. 29.353 + 37 =
  30. 30.142 + 28 =
  31. 31.38 + 29 =
  32. 32.188 + 57 =
  33. 33.30 + 79 =
  34. 34.274 + 89 =
  35. 35.280 + 39 =
  36. 36.415 + 37 =
  37. 37.219 + 77 =
  38. 38.35 + 37 =
  39. 39.473 + 98 =
  40. 40.51 + 99 =

Answer key

  1. 501
  2. 304
  3. 280
  4. 136
  5. 555
  6. 180
  7. 159
  8. 314
  9. 160
  10. 136
  11. 326
  12. 472
  13. 420
  14. 339
  15. 263
  16. 265
  17. 271
  18. 499
  19. 216
  20. 586
  21. 146
  22. 399
  23. 205
  24. 212
  25. 114
  26. 197
  27. 445
  28. 170
  29. 390
  30. 170
  31. 67
  32. 245
  33. 109
  34. 363
  35. 319
  36. 452
  37. 296
  38. 72
  39. 571
  40. 150

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