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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 781 · 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. 1.361 + 79 =
  2. 2.397 + 28 =
  3. 3.108 + 78 =
  4. 4.127 + 97 =
  5. 5.44 + 47 =
  6. 6.160 + 49 =
  7. 7.157 + 49 =
  8. 8.347 + 87 =
  9. 9.270 + 37 =
  10. 10.99 + 97 =
  11. 11.243 + 47 =
  12. 12.415 + 28 =
  13. 13.211 + 47 =
  14. 14.404 + 29 =
  15. 15.231 + 17 =
  16. 16.141 + 68 =
  17. 17.144 + 69 =
  18. 18.262 + 38 =
  19. 19.329 + 39 =
  20. 20.472 + 78 =
  21. 21.398 + 69 =
  22. 22.196 + 97 =
  23. 23.484 + 79 =
  24. 24.97 + 29 =
  25. 25.32 + 18 =
  26. 26.481 + 98 =
  27. 27.29 + 59 =
  28. 28.59 + 79 =
  29. 29.405 + 48 =
  30. 30.490 + 17 =
  31. 31.232 + 68 =
  32. 32.241 + 89 =
  33. 33.113 + 48 =
  34. 34.227 + 99 =
  35. 35.64 + 28 =
  36. 36.181 + 28 =
  37. 37.175 + 67 =
  38. 38.40 + 37 =
  39. 39.270 + 67 =
  40. 40.436 + 48 =

Answer key

  1. 440
  2. 425
  3. 186
  4. 224
  5. 91
  6. 209
  7. 206
  8. 434
  9. 307
  10. 196
  11. 290
  12. 443
  13. 258
  14. 433
  15. 248
  16. 209
  17. 213
  18. 300
  19. 368
  20. 550
  21. 467
  22. 293
  23. 563
  24. 126
  25. 50
  26. 579
  27. 88
  28. 138
  29. 453
  30. 507
  31. 300
  32. 330
  33. 161
  34. 326
  35. 92
  36. 209
  37. 242
  38. 77
  39. 337
  40. 484

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