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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 616 · 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. 1.250 + 89 =
  2. 2.451 + 39 =
  3. 3.375 + 27 =
  4. 4.52 + 98 =
  5. 5.120 + 77 =
  6. 6.157 + 38 =
  7. 7.381 + 57 =
  8. 8.328 + 37 =
  9. 9.398 + 79 =
  10. 10.81 + 39 =
  11. 11.60 + 97 =
  12. 12.90 + 27 =
  13. 13.222 + 47 =
  14. 14.444 + 67 =
  15. 15.144 + 17 =
  16. 16.499 + 58 =
  17. 17.433 + 78 =
  18. 18.472 + 69 =
  19. 19.300 + 49 =
  20. 20.398 + 88 =
  21. 21.465 + 78 =
  22. 22.169 + 87 =
  23. 23.257 + 99 =
  24. 24.158 + 99 =
  25. 25.326 + 28 =
  26. 26.103 + 39 =
  27. 27.230 + 58 =
  28. 28.135 + 97 =
  29. 29.255 + 68 =
  30. 30.70 + 49 =
  31. 31.270 + 67 =
  32. 32.491 + 28 =
  33. 33.423 + 97 =
  34. 34.428 + 88 =
  35. 35.359 + 97 =
  36. 36.434 + 29 =
  37. 37.342 + 47 =
  38. 38.196 + 69 =
  39. 39.233 + 58 =
  40. 40.329 + 29 =

Answer key

  1. 339
  2. 490
  3. 402
  4. 150
  5. 197
  6. 195
  7. 438
  8. 365
  9. 477
  10. 120
  11. 157
  12. 117
  13. 269
  14. 511
  15. 161
  16. 557
  17. 511
  18. 541
  19. 349
  20. 486
  21. 543
  22. 256
  23. 356
  24. 257
  25. 354
  26. 142
  27. 288
  28. 232
  29. 323
  30. 119
  31. 337
  32. 519
  33. 520
  34. 516
  35. 456
  36. 463
  37. 389
  38. 265
  39. 291
  40. 358

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