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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 489 · 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. 1.132 + 27 =
  2. 2.231 + 29 =
  3. 3.99 + 59 =
  4. 4.196 + 78 =
  5. 5.216 + 47 =
  6. 6.387 + 97 =
  7. 7.208 + 37 =
  8. 8.342 + 97 =
  9. 9.161 + 28 =
  10. 10.284 + 68 =
  11. 11.55 + 19 =
  12. 12.478 + 29 =
  13. 13.191 + 27 =
  14. 14.152 + 77 =
  15. 15.438 + 99 =
  16. 16.323 + 39 =
  17. 17.110 + 47 =
  18. 18.289 + 57 =
  19. 19.335 + 28 =
  20. 20.458 + 98 =
  21. 21.146 + 27 =
  22. 22.352 + 97 =
  23. 23.150 + 28 =
  24. 24.291 + 58 =
  25. 25.50 + 49 =
  26. 26.371 + 17 =
  27. 27.418 + 27 =
  28. 28.137 + 69 =
  29. 29.281 + 27 =
  30. 30.146 + 19 =
  31. 31.96 + 87 =
  32. 32.114 + 27 =
  33. 33.419 + 59 =
  34. 34.440 + 97 =
  35. 35.170 + 48 =
  36. 36.221 + 27 =
  37. 37.486 + 77 =
  38. 38.354 + 87 =
  39. 39.278 + 67 =
  40. 40.233 + 18 =

Answer key

  1. 159
  2. 260
  3. 158
  4. 274
  5. 263
  6. 484
  7. 245
  8. 439
  9. 189
  10. 352
  11. 74
  12. 507
  13. 218
  14. 229
  15. 537
  16. 362
  17. 157
  18. 346
  19. 363
  20. 556
  21. 173
  22. 449
  23. 178
  24. 349
  25. 99
  26. 388
  27. 445
  28. 206
  29. 308
  30. 165
  31. 183
  32. 141
  33. 478
  34. 537
  35. 218
  36. 248
  37. 563
  38. 441
  39. 345
  40. 251

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