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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 709 · 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. 1.169 + 59 =
  2. 2.360 + 17 =
  3. 3.445 + 69 =
  4. 4.310 + 27 =
  5. 5.84 + 97 =
  6. 6.76 + 68 =
  7. 7.31 + 19 =
  8. 8.346 + 97 =
  9. 9.234 + 88 =
  10. 10.446 + 87 =
  11. 11.286 + 59 =
  12. 12.111 + 99 =
  13. 13.494 + 88 =
  14. 14.250 + 17 =
  15. 15.318 + 29 =
  16. 16.263 + 18 =
  17. 17.141 + 48 =
  18. 18.52 + 58 =
  19. 19.134 + 39 =
  20. 20.145 + 28 =
  21. 21.389 + 57 =
  22. 22.454 + 68 =
  23. 23.304 + 38 =
  24. 24.478 + 29 =
  25. 25.331 + 18 =
  26. 26.261 + 79 =
  27. 27.207 + 68 =
  28. 28.279 + 49 =
  29. 29.409 + 77 =
  30. 30.442 + 27 =
  31. 31.383 + 49 =
  32. 32.130 + 49 =
  33. 33.58 + 67 =
  34. 34.342 + 17 =
  35. 35.210 + 89 =
  36. 36.121 + 98 =
  37. 37.128 + 87 =
  38. 38.455 + 47 =
  39. 39.60 + 77 =
  40. 40.317 + 18 =

Answer key

  1. 228
  2. 377
  3. 514
  4. 337
  5. 181
  6. 144
  7. 50
  8. 443
  9. 322
  10. 533
  11. 345
  12. 210
  13. 582
  14. 267
  15. 347
  16. 281
  17. 189
  18. 110
  19. 173
  20. 173
  21. 446
  22. 522
  23. 342
  24. 507
  25. 349
  26. 340
  27. 275
  28. 328
  29. 486
  30. 469
  31. 432
  32. 179
  33. 125
  34. 359
  35. 299
  36. 219
  37. 215
  38. 502
  39. 137
  40. 335

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