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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 453 · 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. 1.377 + 28 =
  2. 2.93 + 37 =
  3. 3.469 + 87 =
  4. 4.204 + 99 =
  5. 5.134 + 27 =
  6. 6.484 + 27 =
  7. 7.420 + 27 =
  8. 8.151 + 18 =
  9. 9.62 + 58 =
  10. 10.378 + 47 =
  11. 11.468 + 18 =
  12. 12.132 + 67 =
  13. 13.106 + 77 =
  14. 14.306 + 99 =
  15. 15.321 + 29 =
  16. 16.183 + 57 =
  17. 17.59 + 89 =
  18. 18.283 + 78 =
  19. 19.32 + 37 =
  20. 20.296 + 17 =
  21. 21.417 + 19 =
  22. 22.374 + 29 =
  23. 23.132 + 77 =
  24. 24.112 + 39 =
  25. 25.247 + 27 =
  26. 26.84 + 29 =
  27. 27.452 + 79 =
  28. 28.157 + 17 =
  29. 29.435 + 88 =
  30. 30.356 + 58 =
  31. 31.493 + 77 =
  32. 32.323 + 77 =
  33. 33.182 + 17 =
  34. 34.116 + 37 =
  35. 35.490 + 88 =
  36. 36.158 + 19 =
  37. 37.104 + 89 =
  38. 38.44 + 99 =
  39. 39.193 + 68 =
  40. 40.423 + 39 =

Answer key

  1. 405
  2. 130
  3. 556
  4. 303
  5. 161
  6. 511
  7. 447
  8. 169
  9. 120
  10. 425
  11. 486
  12. 199
  13. 183
  14. 405
  15. 350
  16. 240
  17. 148
  18. 361
  19. 69
  20. 313
  21. 436
  22. 403
  23. 209
  24. 151
  25. 274
  26. 113
  27. 531
  28. 174
  29. 523
  30. 414
  31. 570
  32. 400
  33. 199
  34. 153
  35. 578
  36. 177
  37. 193
  38. 143
  39. 261
  40. 462

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