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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 603 · 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. 1.450 + 18 =
  2. 2.384 + 28 =
  3. 3.377 + 69 =
  4. 4.338 + 27 =
  5. 5.477 + 37 =
  6. 6.180 + 19 =
  7. 7.320 + 48 =
  8. 8.278 + 17 =
  9. 9.115 + 58 =
  10. 10.433 + 27 =
  11. 11.277 + 58 =
  12. 12.171 + 37 =
  13. 13.313 + 89 =
  14. 14.47 + 38 =
  15. 15.360 + 79 =
  16. 16.84 + 48 =
  17. 17.122 + 87 =
  18. 18.282 + 37 =
  19. 19.76 + 97 =
  20. 20.230 + 27 =
  21. 21.162 + 37 =
  22. 22.181 + 58 =
  23. 23.206 + 57 =
  24. 24.49 + 29 =
  25. 25.120 + 89 =
  26. 26.284 + 99 =
  27. 27.59 + 18 =
  28. 28.291 + 68 =
  29. 29.179 + 87 =
  30. 30.223 + 68 =
  31. 31.340 + 69 =
  32. 32.97 + 97 =
  33. 33.460 + 39 =
  34. 34.335 + 27 =
  35. 35.368 + 97 =
  36. 36.68 + 78 =
  37. 37.178 + 27 =
  38. 38.310 + 98 =
  39. 39.164 + 79 =
  40. 40.200 + 88 =

Answer key

  1. 468
  2. 412
  3. 446
  4. 365
  5. 514
  6. 199
  7. 368
  8. 295
  9. 173
  10. 460
  11. 335
  12. 208
  13. 402
  14. 85
  15. 439
  16. 132
  17. 209
  18. 319
  19. 173
  20. 257
  21. 199
  22. 239
  23. 263
  24. 78
  25. 209
  26. 383
  27. 77
  28. 359
  29. 266
  30. 291
  31. 409
  32. 194
  33. 499
  34. 362
  35. 465
  36. 146
  37. 205
  38. 408
  39. 243
  40. 288

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