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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 794 · 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. 1.74 + 67 =
  2. 2.169 + 27 =
  3. 3.109 + 98 =
  4. 4.275 + 27 =
  5. 5.45 + 99 =
  6. 6.196 + 27 =
  7. 7.285 + 57 =
  8. 8.72 + 79 =
  9. 9.223 + 37 =
  10. 10.208 + 49 =
  11. 11.74 + 49 =
  12. 12.61 + 59 =
  13. 13.290 + 78 =
  14. 14.336 + 89 =
  15. 15.444 + 28 =
  16. 16.51 + 78 =
  17. 17.485 + 59 =
  18. 18.362 + 49 =
  19. 19.458 + 18 =
  20. 20.292 + 59 =
  21. 21.262 + 77 =
  22. 22.236 + 38 =
  23. 23.309 + 17 =
  24. 24.27 + 38 =
  25. 25.299 + 28 =
  26. 26.462 + 87 =
  27. 27.88 + 67 =
  28. 28.320 + 47 =
  29. 29.306 + 17 =
  30. 30.482 + 39 =
  31. 31.499 + 49 =
  32. 32.153 + 89 =
  33. 33.283 + 27 =
  34. 34.311 + 17 =
  35. 35.441 + 87 =
  36. 36.186 + 17 =
  37. 37.407 + 69 =
  38. 38.147 + 28 =
  39. 39.395 + 69 =
  40. 40.108 + 88 =

Answer key

  1. 141
  2. 196
  3. 207
  4. 302
  5. 144
  6. 223
  7. 342
  8. 151
  9. 260
  10. 257
  11. 123
  12. 120
  13. 368
  14. 425
  15. 472
  16. 129
  17. 544
  18. 411
  19. 476
  20. 351
  21. 339
  22. 274
  23. 326
  24. 65
  25. 327
  26. 549
  27. 155
  28. 367
  29. 323
  30. 521
  31. 548
  32. 242
  33. 310
  34. 328
  35. 528
  36. 203
  37. 476
  38. 175
  39. 464
  40. 196

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