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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 556 · 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. 1.320 + 67 =
  2. 2.495 + 38 =
  3. 3.58 + 37 =
  4. 4.408 + 97 =
  5. 5.140 + 59 =
  6. 6.474 + 48 =
  7. 7.303 + 19 =
  8. 8.34 + 59 =
  9. 9.159 + 29 =
  10. 10.271 + 27 =
  11. 11.488 + 89 =
  12. 12.229 + 19 =
  13. 13.193 + 99 =
  14. 14.279 + 99 =
  15. 15.181 + 48 =
  16. 16.471 + 19 =
  17. 17.337 + 58 =
  18. 18.109 + 88 =
  19. 19.377 + 17 =
  20. 20.69 + 48 =
  21. 21.322 + 77 =
  22. 22.202 + 38 =
  23. 23.51 + 19 =
  24. 24.456 + 47 =
  25. 25.377 + 17 =
  26. 26.38 + 17 =
  27. 27.104 + 89 =
  28. 28.390 + 49 =
  29. 29.35 + 19 =
  30. 30.288 + 68 =
  31. 31.182 + 68 =
  32. 32.318 + 17 =
  33. 33.433 + 27 =
  34. 34.374 + 77 =
  35. 35.304 + 97 =
  36. 36.465 + 67 =
  37. 37.466 + 37 =
  38. 38.233 + 39 =
  39. 39.466 + 87 =
  40. 40.130 + 97 =

Answer key

  1. 387
  2. 533
  3. 95
  4. 505
  5. 199
  6. 522
  7. 322
  8. 93
  9. 188
  10. 298
  11. 577
  12. 248
  13. 292
  14. 378
  15. 229
  16. 490
  17. 395
  18. 197
  19. 394
  20. 117
  21. 399
  22. 240
  23. 70
  24. 503
  25. 394
  26. 55
  27. 193
  28. 439
  29. 54
  30. 356
  31. 250
  32. 335
  33. 460
  34. 451
  35. 401
  36. 532
  37. 503
  38. 272
  39. 553
  40. 227

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