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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 535 · 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. 1.421 + 59 =
  2. 2.149 + 39 =
  3. 3.419 + 59 =
  4. 4.484 + 69 =
  5. 5.452 + 57 =
  6. 6.252 + 69 =
  7. 7.354 + 29 =
  8. 8.183 + 18 =
  9. 9.58 + 49 =
  10. 10.353 + 89 =
  11. 11.309 + 58 =
  12. 12.172 + 78 =
  13. 13.370 + 47 =
  14. 14.262 + 67 =
  15. 15.157 + 98 =
  16. 16.389 + 38 =
  17. 17.279 + 97 =
  18. 18.404 + 78 =
  19. 19.283 + 89 =
  20. 20.50 + 49 =
  21. 21.485 + 18 =
  22. 22.380 + 27 =
  23. 23.240 + 29 =
  24. 24.259 + 17 =
  25. 25.64 + 47 =
  26. 26.141 + 79 =
  27. 27.70 + 18 =
  28. 28.249 + 48 =
  29. 29.33 + 38 =
  30. 30.274 + 78 =
  31. 31.269 + 48 =
  32. 32.418 + 18 =
  33. 33.322 + 98 =
  34. 34.445 + 68 =
  35. 35.302 + 37 =
  36. 36.94 + 38 =
  37. 37.161 + 98 =
  38. 38.271 + 57 =
  39. 39.53 + 77 =
  40. 40.86 + 28 =

Answer key

  1. 480
  2. 188
  3. 478
  4. 553
  5. 509
  6. 321
  7. 383
  8. 201
  9. 107
  10. 442
  11. 367
  12. 250
  13. 417
  14. 329
  15. 255
  16. 427
  17. 376
  18. 482
  19. 372
  20. 99
  21. 503
  22. 407
  23. 269
  24. 276
  25. 111
  26. 220
  27. 88
  28. 297
  29. 71
  30. 352
  31. 317
  32. 436
  33. 420
  34. 513
  35. 339
  36. 132
  37. 259
  38. 328
  39. 130
  40. 114

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