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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 580 · 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. 1.400 + 89 =
  2. 2.58 + 49 =
  3. 3.337 + 18 =
  4. 4.381 + 77 =
  5. 5.360 + 27 =
  6. 6.179 + 99 =
  7. 7.67 + 99 =
  8. 8.241 + 27 =
  9. 9.398 + 67 =
  10. 10.369 + 87 =
  11. 11.398 + 27 =
  12. 12.220 + 17 =
  13. 13.363 + 27 =
  14. 14.414 + 29 =
  15. 15.122 + 78 =
  16. 16.397 + 27 =
  17. 17.401 + 27 =
  18. 18.435 + 19 =
  19. 19.114 + 38 =
  20. 20.287 + 19 =
  21. 21.253 + 59 =
  22. 22.158 + 19 =
  23. 23.193 + 57 =
  24. 24.178 + 79 =
  25. 25.93 + 39 =
  26. 26.131 + 47 =
  27. 27.284 + 67 =
  28. 28.379 + 98 =
  29. 29.298 + 37 =
  30. 30.351 + 99 =
  31. 31.227 + 17 =
  32. 32.488 + 97 =
  33. 33.93 + 77 =
  34. 34.315 + 68 =
  35. 35.412 + 67 =
  36. 36.349 + 58 =
  37. 37.486 + 67 =
  38. 38.69 + 69 =
  39. 39.227 + 78 =
  40. 40.93 + 38 =

Answer key

  1. 489
  2. 107
  3. 355
  4. 458
  5. 387
  6. 278
  7. 166
  8. 268
  9. 465
  10. 456
  11. 425
  12. 237
  13. 390
  14. 443
  15. 200
  16. 424
  17. 428
  18. 454
  19. 152
  20. 306
  21. 312
  22. 177
  23. 250
  24. 257
  25. 132
  26. 178
  27. 351
  28. 477
  29. 335
  30. 450
  31. 244
  32. 585
  33. 170
  34. 383
  35. 479
  36. 407
  37. 553
  38. 138
  39. 305
  40. 131

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