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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 742 · 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. 1.277 + 37 =
  2. 2.389 + 38 =
  3. 3.496 + 47 =
  4. 4.214 + 28 =
  5. 5.481 + 48 =
  6. 6.203 + 99 =
  7. 7.338 + 69 =
  8. 8.151 + 27 =
  9. 9.345 + 97 =
  10. 10.175 + 87 =
  11. 11.195 + 27 =
  12. 12.217 + 97 =
  13. 13.455 + 67 =
  14. 14.320 + 77 =
  15. 15.250 + 28 =
  16. 16.154 + 57 =
  17. 17.379 + 57 =
  18. 18.349 + 98 =
  19. 19.111 + 97 =
  20. 20.317 + 87 =
  21. 21.143 + 18 =
  22. 22.440 + 57 =
  23. 23.84 + 59 =
  24. 24.135 + 49 =
  25. 25.364 + 37 =
  26. 26.208 + 59 =
  27. 27.411 + 87 =
  28. 28.493 + 58 =
  29. 29.272 + 89 =
  30. 30.227 + 47 =
  31. 31.84 + 17 =
  32. 32.104 + 19 =
  33. 33.197 + 67 =
  34. 34.124 + 68 =
  35. 35.103 + 38 =
  36. 36.110 + 49 =
  37. 37.472 + 47 =
  38. 38.194 + 88 =
  39. 39.153 + 87 =
  40. 40.135 + 59 =

Answer key

  1. 314
  2. 427
  3. 543
  4. 242
  5. 529
  6. 302
  7. 407
  8. 178
  9. 442
  10. 262
  11. 222
  12. 314
  13. 522
  14. 397
  15. 278
  16. 211
  17. 436
  18. 447
  19. 208
  20. 404
  21. 161
  22. 497
  23. 143
  24. 184
  25. 401
  26. 267
  27. 498
  28. 551
  29. 361
  30. 274
  31. 101
  32. 123
  33. 264
  34. 192
  35. 141
  36. 159
  37. 519
  38. 282
  39. 240
  40. 194

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