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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 73 · 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. 1.232 + 59 =
  2. 2.370 + 57 =
  3. 3.253 + 37 =
  4. 4.412 + 39 =
  5. 5.437 + 87 =
  6. 6.65 + 67 =
  7. 7.395 + 69 =
  8. 8.150 + 27 =
  9. 9.246 + 67 =
  10. 10.144 + 47 =
  11. 11.448 + 59 =
  12. 12.441 + 37 =
  13. 13.161 + 77 =
  14. 14.263 + 88 =
  15. 15.290 + 18 =
  16. 16.300 + 69 =
  17. 17.461 + 98 =
  18. 18.470 + 77 =
  19. 19.165 + 27 =
  20. 20.81 + 19 =
  21. 21.123 + 38 =
  22. 22.434 + 39 =
  23. 23.276 + 87 =
  24. 24.44 + 77 =
  25. 25.150 + 27 =
  26. 26.155 + 47 =
  27. 27.231 + 19 =
  28. 28.301 + 77 =
  29. 29.365 + 78 =
  30. 30.140 + 98 =
  31. 31.111 + 37 =
  32. 32.265 + 57 =
  33. 33.67 + 87 =
  34. 34.78 + 17 =
  35. 35.473 + 29 =
  36. 36.178 + 48 =
  37. 37.246 + 59 =
  38. 38.237 + 29 =
  39. 39.308 + 97 =
  40. 40.211 + 37 =

Answer key

  1. 291
  2. 427
  3. 290
  4. 451
  5. 524
  6. 132
  7. 464
  8. 177
  9. 313
  10. 191
  11. 507
  12. 478
  13. 238
  14. 351
  15. 308
  16. 369
  17. 559
  18. 547
  19. 192
  20. 100
  21. 161
  22. 473
  23. 363
  24. 121
  25. 177
  26. 202
  27. 250
  28. 378
  29. 443
  30. 238
  31. 148
  32. 322
  33. 154
  34. 95
  35. 502
  36. 226
  37. 305
  38. 266
  39. 405
  40. 248

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