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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 613 · 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. 1.321 + 19 =
  2. 2.98 + 57 =
  3. 3.484 + 58 =
  4. 4.320 + 48 =
  5. 5.141 + 49 =
  6. 6.366 + 28 =
  7. 7.92 + 88 =
  8. 8.292 + 97 =
  9. 9.271 + 77 =
  10. 10.146 + 87 =
  11. 11.273 + 19 =
  12. 12.304 + 69 =
  13. 13.109 + 99 =
  14. 14.67 + 98 =
  15. 15.327 + 77 =
  16. 16.71 + 37 =
  17. 17.479 + 17 =
  18. 18.40 + 27 =
  19. 19.388 + 98 =
  20. 20.283 + 67 =
  21. 21.145 + 99 =
  22. 22.155 + 28 =
  23. 23.289 + 97 =
  24. 24.388 + 39 =
  25. 25.102 + 37 =
  26. 26.39 + 77 =
  27. 27.266 + 17 =
  28. 28.210 + 67 =
  29. 29.333 + 77 =
  30. 30.182 + 87 =
  31. 31.303 + 99 =
  32. 32.126 + 38 =
  33. 33.310 + 87 =
  34. 34.467 + 18 =
  35. 35.261 + 47 =
  36. 36.245 + 28 =
  37. 37.158 + 59 =
  38. 38.277 + 49 =
  39. 39.447 + 47 =
  40. 40.230 + 88 =

Answer key

  1. 340
  2. 155
  3. 542
  4. 368
  5. 190
  6. 394
  7. 180
  8. 389
  9. 348
  10. 233
  11. 292
  12. 373
  13. 208
  14. 165
  15. 404
  16. 108
  17. 496
  18. 67
  19. 486
  20. 350
  21. 244
  22. 183
  23. 386
  24. 427
  25. 139
  26. 116
  27. 283
  28. 277
  29. 410
  30. 269
  31. 402
  32. 164
  33. 397
  34. 485
  35. 308
  36. 273
  37. 217
  38. 326
  39. 494
  40. 318

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