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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 195 · 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. 1.46 + 78 =
  2. 2.308 + 69 =
  3. 3.164 + 87 =
  4. 4.462 + 68 =
  5. 5.279 + 89 =
  6. 6.461 + 89 =
  7. 7.313 + 97 =
  8. 8.99 + 68 =
  9. 9.291 + 57 =
  10. 10.238 + 79 =
  11. 11.88 + 87 =
  12. 12.454 + 29 =
  13. 13.61 + 39 =
  14. 14.137 + 57 =
  15. 15.270 + 17 =
  16. 16.47 + 38 =
  17. 17.112 + 29 =
  18. 18.46 + 19 =
  19. 19.37 + 59 =
  20. 20.384 + 78 =
  21. 21.248 + 57 =
  22. 22.110 + 38 =
  23. 23.327 + 67 =
  24. 24.458 + 27 =
  25. 25.264 + 97 =
  26. 26.174 + 79 =
  27. 27.415 + 38 =
  28. 28.86 + 37 =
  29. 29.227 + 17 =
  30. 30.489 + 97 =
  31. 31.163 + 58 =
  32. 32.379 + 58 =
  33. 33.84 + 27 =
  34. 34.169 + 19 =
  35. 35.106 + 69 =
  36. 36.292 + 78 =
  37. 37.444 + 57 =
  38. 38.372 + 47 =
  39. 39.141 + 38 =
  40. 40.74 + 58 =

Answer key

  1. 124
  2. 377
  3. 251
  4. 530
  5. 368
  6. 550
  7. 410
  8. 167
  9. 348
  10. 317
  11. 175
  12. 483
  13. 100
  14. 194
  15. 287
  16. 85
  17. 141
  18. 65
  19. 96
  20. 462
  21. 305
  22. 148
  23. 394
  24. 485
  25. 361
  26. 253
  27. 453
  28. 123
  29. 244
  30. 586
  31. 221
  32. 437
  33. 111
  34. 188
  35. 175
  36. 370
  37. 501
  38. 419
  39. 179
  40. 132

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