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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 406 · 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. 1.438 + 88 =
  2. 2.219 + 47 =
  3. 3.212 + 88 =
  4. 4.333 + 98 =
  5. 5.175 + 28 =
  6. 6.163 + 79 =
  7. 7.360 + 97 =
  8. 8.96 + 78 =
  9. 9.327 + 97 =
  10. 10.353 + 97 =
  11. 11.160 + 48 =
  12. 12.400 + 49 =
  13. 13.72 + 38 =
  14. 14.288 + 97 =
  15. 15.489 + 57 =
  16. 16.217 + 87 =
  17. 17.184 + 57 =
  18. 18.332 + 69 =
  19. 19.266 + 57 =
  20. 20.35 + 89 =
  21. 21.140 + 29 =
  22. 22.153 + 67 =
  23. 23.232 + 38 =
  24. 24.351 + 38 =
  25. 25.430 + 78 =
  26. 26.415 + 77 =
  27. 27.410 + 89 =
  28. 28.220 + 79 =
  29. 29.25 + 17 =
  30. 30.51 + 29 =
  31. 31.481 + 49 =
  32. 32.29 + 17 =
  33. 33.86 + 28 =
  34. 34.313 + 27 =
  35. 35.256 + 79 =
  36. 36.316 + 18 =
  37. 37.74 + 87 =
  38. 38.119 + 27 =
  39. 39.457 + 59 =
  40. 40.272 + 88 =

Answer key

  1. 526
  2. 266
  3. 300
  4. 431
  5. 203
  6. 242
  7. 457
  8. 174
  9. 424
  10. 450
  11. 208
  12. 449
  13. 110
  14. 385
  15. 546
  16. 304
  17. 241
  18. 401
  19. 323
  20. 124
  21. 169
  22. 220
  23. 270
  24. 389
  25. 508
  26. 492
  27. 499
  28. 299
  29. 42
  30. 80
  31. 530
  32. 46
  33. 114
  34. 340
  35. 335
  36. 334
  37. 161
  38. 146
  39. 516
  40. 360

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