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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 911 · 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. 1.216 + 87 =
  2. 2.47 + 87 =
  3. 3.451 + 69 =
  4. 4.93 + 78 =
  5. 5.473 + 48 =
  6. 6.74 + 68 =
  7. 7.60 + 29 =
  8. 8.394 + 88 =
  9. 9.390 + 49 =
  10. 10.308 + 39 =
  11. 11.462 + 68 =
  12. 12.419 + 19 =
  13. 13.375 + 19 =
  14. 14.270 + 97 =
  15. 15.413 + 38 =
  16. 16.243 + 59 =
  17. 17.53 + 28 =
  18. 18.268 + 57 =
  19. 19.262 + 28 =
  20. 20.67 + 58 =
  21. 21.334 + 69 =
  22. 22.172 + 99 =
  23. 23.175 + 97 =
  24. 24.148 + 79 =
  25. 25.129 + 67 =
  26. 26.172 + 98 =
  27. 27.83 + 28 =
  28. 28.199 + 77 =
  29. 29.53 + 69 =
  30. 30.355 + 59 =
  31. 31.462 + 17 =
  32. 32.449 + 57 =
  33. 33.103 + 49 =
  34. 34.302 + 69 =
  35. 35.397 + 78 =
  36. 36.339 + 37 =
  37. 37.288 + 18 =
  38. 38.100 + 87 =
  39. 39.196 + 47 =
  40. 40.338 + 98 =

Answer key

  1. 303
  2. 134
  3. 520
  4. 171
  5. 521
  6. 142
  7. 89
  8. 482
  9. 439
  10. 347
  11. 530
  12. 438
  13. 394
  14. 367
  15. 451
  16. 302
  17. 81
  18. 325
  19. 290
  20. 125
  21. 403
  22. 271
  23. 272
  24. 227
  25. 196
  26. 270
  27. 111
  28. 276
  29. 122
  30. 414
  31. 479
  32. 506
  33. 152
  34. 371
  35. 475
  36. 376
  37. 306
  38. 187
  39. 243
  40. 436

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