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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 231 · 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. 1.28 + 19 =
  2. 2.196 + 99 =
  3. 3.434 + 78 =
  4. 4.187 + 97 =
  5. 5.468 + 28 =
  6. 6.123 + 57 =
  7. 7.104 + 19 =
  8. 8.122 + 77 =
  9. 9.267 + 29 =
  10. 10.75 + 59 =
  11. 11.491 + 19 =
  12. 12.148 + 58 =
  13. 13.138 + 19 =
  14. 14.466 + 67 =
  15. 15.339 + 19 =
  16. 16.177 + 79 =
  17. 17.64 + 39 =
  18. 18.410 + 98 =
  19. 19.295 + 48 =
  20. 20.104 + 57 =
  21. 21.295 + 78 =
  22. 22.315 + 67 =
  23. 23.465 + 48 =
  24. 24.476 + 79 =
  25. 25.199 + 49 =
  26. 26.149 + 59 =
  27. 27.165 + 17 =
  28. 28.202 + 98 =
  29. 29.189 + 69 =
  30. 30.422 + 18 =
  31. 31.499 + 27 =
  32. 32.184 + 69 =
  33. 33.165 + 49 =
  34. 34.188 + 79 =
  35. 35.294 + 99 =
  36. 36.123 + 89 =
  37. 37.195 + 37 =
  38. 38.415 + 39 =
  39. 39.330 + 88 =
  40. 40.417 + 38 =

Answer key

  1. 47
  2. 295
  3. 512
  4. 284
  5. 496
  6. 180
  7. 123
  8. 199
  9. 296
  10. 134
  11. 510
  12. 206
  13. 157
  14. 533
  15. 358
  16. 256
  17. 103
  18. 508
  19. 343
  20. 161
  21. 373
  22. 382
  23. 513
  24. 555
  25. 248
  26. 208
  27. 182
  28. 300
  29. 258
  30. 440
  31. 526
  32. 253
  33. 214
  34. 267
  35. 393
  36. 212
  37. 232
  38. 454
  39. 418
  40. 455

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