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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 63 · 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. 1.112 + 47 =
  2. 2.225 + 28 =
  3. 3.305 + 18 =
  4. 4.179 + 79 =
  5. 5.187 + 69 =
  6. 6.315 + 17 =
  7. 7.423 + 29 =
  8. 8.75 + 69 =
  9. 9.138 + 69 =
  10. 10.263 + 18 =
  11. 11.451 + 68 =
  12. 12.76 + 27 =
  13. 13.85 + 19 =
  14. 14.194 + 18 =
  15. 15.171 + 39 =
  16. 16.65 + 68 =
  17. 17.126 + 88 =
  18. 18.251 + 77 =
  19. 19.393 + 88 =
  20. 20.261 + 28 =
  21. 21.110 + 87 =
  22. 22.152 + 78 =
  23. 23.288 + 98 =
  24. 24.96 + 17 =
  25. 25.70 + 49 =
  26. 26.67 + 67 =
  27. 27.411 + 38 =
  28. 28.242 + 58 =
  29. 29.303 + 28 =
  30. 30.465 + 37 =
  31. 31.484 + 47 =
  32. 32.485 + 49 =
  33. 33.444 + 97 =
  34. 34.61 + 58 =
  35. 35.201 + 89 =
  36. 36.312 + 87 =
  37. 37.240 + 58 =
  38. 38.359 + 37 =
  39. 39.224 + 38 =
  40. 40.104 + 89 =

Answer key

  1. 159
  2. 253
  3. 323
  4. 258
  5. 256
  6. 332
  7. 452
  8. 144
  9. 207
  10. 281
  11. 519
  12. 103
  13. 104
  14. 212
  15. 210
  16. 133
  17. 214
  18. 328
  19. 481
  20. 289
  21. 197
  22. 230
  23. 386
  24. 113
  25. 119
  26. 134
  27. 449
  28. 300
  29. 331
  30. 502
  31. 531
  32. 534
  33. 541
  34. 119
  35. 290
  36. 399
  37. 298
  38. 396
  39. 262
  40. 193

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