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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 31 · 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. 1.119 + 18 =
  2. 2.458 + 79 =
  3. 3.94 + 77 =
  4. 4.433 + 77 =
  5. 5.445 + 27 =
  6. 6.378 + 97 =
  7. 7.65 + 27 =
  8. 8.463 + 29 =
  9. 9.74 + 68 =
  10. 10.193 + 37 =
  11. 11.447 + 69 =
  12. 12.48 + 47 =
  13. 13.142 + 67 =
  14. 14.257 + 78 =
  15. 15.313 + 68 =
  16. 16.427 + 28 =
  17. 17.490 + 48 =
  18. 18.388 + 87 =
  19. 19.196 + 48 =
  20. 20.336 + 99 =
  21. 21.410 + 97 =
  22. 22.36 + 77 =
  23. 23.390 + 37 =
  24. 24.480 + 39 =
  25. 25.216 + 38 =
  26. 26.483 + 67 =
  27. 27.94 + 87 =
  28. 28.122 + 47 =
  29. 29.308 + 49 =
  30. 30.126 + 17 =
  31. 31.295 + 97 =
  32. 32.330 + 67 =
  33. 33.95 + 39 =
  34. 34.367 + 47 =
  35. 35.476 + 28 =
  36. 36.268 + 27 =
  37. 37.105 + 27 =
  38. 38.280 + 69 =
  39. 39.134 + 57 =
  40. 40.429 + 28 =

Answer key

  1. 137
  2. 537
  3. 171
  4. 510
  5. 472
  6. 475
  7. 92
  8. 492
  9. 142
  10. 230
  11. 516
  12. 95
  13. 209
  14. 335
  15. 381
  16. 455
  17. 538
  18. 475
  19. 244
  20. 435
  21. 507
  22. 113
  23. 427
  24. 519
  25. 254
  26. 550
  27. 181
  28. 169
  29. 357
  30. 143
  31. 392
  32. 397
  33. 134
  34. 414
  35. 504
  36. 295
  37. 132
  38. 349
  39. 191
  40. 457

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