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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 259 · 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. 1.250 + 97 =
  2. 2.389 + 87 =
  3. 3.123 + 99 =
  4. 4.26 + 29 =
  5. 5.301 + 39 =
  6. 6.448 + 77 =
  7. 7.254 + 39 =
  8. 8.185 + 87 =
  9. 9.485 + 68 =
  10. 10.88 + 77 =
  11. 11.63 + 28 =
  12. 12.143 + 17 =
  13. 13.450 + 68 =
  14. 14.50 + 97 =
  15. 15.357 + 19 =
  16. 16.271 + 59 =
  17. 17.329 + 67 =
  18. 18.226 + 57 =
  19. 19.135 + 98 =
  20. 20.485 + 77 =
  21. 21.152 + 38 =
  22. 22.426 + 97 =
  23. 23.48 + 48 =
  24. 24.338 + 59 =
  25. 25.485 + 78 =
  26. 26.137 + 68 =
  27. 27.391 + 48 =
  28. 28.159 + 28 =
  29. 29.260 + 28 =
  30. 30.234 + 78 =
  31. 31.219 + 97 =
  32. 32.85 + 47 =
  33. 33.447 + 57 =
  34. 34.245 + 37 =
  35. 35.105 + 89 =
  36. 36.360 + 17 =
  37. 37.99 + 47 =
  38. 38.307 + 67 =
  39. 39.472 + 17 =
  40. 40.150 + 99 =

Answer key

  1. 347
  2. 476
  3. 222
  4. 55
  5. 340
  6. 525
  7. 293
  8. 272
  9. 553
  10. 165
  11. 91
  12. 160
  13. 518
  14. 147
  15. 376
  16. 330
  17. 396
  18. 283
  19. 233
  20. 562
  21. 190
  22. 523
  23. 96
  24. 397
  25. 563
  26. 205
  27. 439
  28. 187
  29. 288
  30. 312
  31. 316
  32. 132
  33. 504
  34. 282
  35. 194
  36. 377
  37. 146
  38. 374
  39. 489
  40. 249

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