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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 536 · 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. 1.165 + 97 =
  2. 2.282 + 89 =
  3. 3.177 + 87 =
  4. 4.439 + 37 =
  5. 5.492 + 19 =
  6. 6.90 + 17 =
  7. 7.214 + 37 =
  8. 8.485 + 37 =
  9. 9.393 + 47 =
  10. 10.113 + 88 =
  11. 11.69 + 99 =
  12. 12.471 + 57 =
  13. 13.180 + 28 =
  14. 14.316 + 99 =
  15. 15.59 + 87 =
  16. 16.197 + 17 =
  17. 17.96 + 58 =
  18. 18.159 + 19 =
  19. 19.433 + 68 =
  20. 20.331 + 99 =
  21. 21.198 + 87 =
  22. 22.220 + 88 =
  23. 23.303 + 38 =
  24. 24.395 + 87 =
  25. 25.147 + 29 =
  26. 26.256 + 19 =
  27. 27.342 + 97 =
  28. 28.183 + 38 =
  29. 29.89 + 17 =
  30. 30.163 + 77 =
  31. 31.209 + 18 =
  32. 32.251 + 89 =
  33. 33.355 + 99 =
  34. 34.297 + 37 =
  35. 35.30 + 59 =
  36. 36.289 + 19 =
  37. 37.199 + 19 =
  38. 38.346 + 69 =
  39. 39.87 + 28 =
  40. 40.453 + 99 =

Answer key

  1. 262
  2. 371
  3. 264
  4. 476
  5. 511
  6. 107
  7. 251
  8. 522
  9. 440
  10. 201
  11. 168
  12. 528
  13. 208
  14. 415
  15. 146
  16. 214
  17. 154
  18. 178
  19. 501
  20. 430
  21. 285
  22. 308
  23. 341
  24. 482
  25. 176
  26. 275
  27. 439
  28. 221
  29. 106
  30. 240
  31. 227
  32. 340
  33. 454
  34. 334
  35. 89
  36. 308
  37. 218
  38. 415
  39. 115
  40. 552

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