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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 591 · 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. 1.198 + 77 =
  2. 2.330 + 87 =
  3. 3.326 + 19 =
  4. 4.235 + 27 =
  5. 5.297 + 27 =
  6. 6.371 + 58 =
  7. 7.486 + 88 =
  8. 8.329 + 28 =
  9. 9.376 + 67 =
  10. 10.157 + 97 =
  11. 11.124 + 68 =
  12. 12.203 + 77 =
  13. 13.133 + 79 =
  14. 14.394 + 59 =
  15. 15.70 + 17 =
  16. 16.168 + 97 =
  17. 17.402 + 37 =
  18. 18.486 + 47 =
  19. 19.496 + 89 =
  20. 20.227 + 57 =
  21. 21.68 + 38 =
  22. 22.37 + 18 =
  23. 23.271 + 38 =
  24. 24.84 + 87 =
  25. 25.213 + 88 =
  26. 26.173 + 17 =
  27. 27.83 + 57 =
  28. 28.377 + 39 =
  29. 29.197 + 97 =
  30. 30.329 + 58 =
  31. 31.429 + 59 =
  32. 32.241 + 97 =
  33. 33.424 + 67 =
  34. 34.217 + 48 =
  35. 35.497 + 19 =
  36. 36.263 + 57 =
  37. 37.133 + 69 =
  38. 38.418 + 98 =
  39. 39.278 + 59 =
  40. 40.282 + 27 =

Answer key

  1. 275
  2. 417
  3. 345
  4. 262
  5. 324
  6. 429
  7. 574
  8. 357
  9. 443
  10. 254
  11. 192
  12. 280
  13. 212
  14. 453
  15. 87
  16. 265
  17. 439
  18. 533
  19. 585
  20. 284
  21. 106
  22. 55
  23. 309
  24. 171
  25. 301
  26. 190
  27. 140
  28. 416
  29. 294
  30. 387
  31. 488
  32. 338
  33. 491
  34. 265
  35. 516
  36. 320
  37. 202
  38. 516
  39. 337
  40. 309

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