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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 983 · 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. 1.50 + 17 =
  2. 2.363 + 28 =
  3. 3.31 + 97 =
  4. 4.38 + 89 =
  5. 5.124 + 77 =
  6. 6.449 + 18 =
  7. 7.29 + 77 =
  8. 8.90 + 27 =
  9. 9.68 + 98 =
  10. 10.230 + 48 =
  11. 11.335 + 19 =
  12. 12.212 + 48 =
  13. 13.417 + 99 =
  14. 14.129 + 28 =
  15. 15.361 + 69 =
  16. 16.32 + 39 =
  17. 17.54 + 58 =
  18. 18.155 + 98 =
  19. 19.390 + 18 =
  20. 20.85 + 49 =
  21. 21.387 + 78 =
  22. 22.337 + 29 =
  23. 23.487 + 97 =
  24. 24.236 + 39 =
  25. 25.73 + 58 =
  26. 26.434 + 87 =
  27. 27.273 + 59 =
  28. 28.192 + 29 =
  29. 29.324 + 29 =
  30. 30.327 + 17 =
  31. 31.58 + 39 =
  32. 32.77 + 27 =
  33. 33.27 + 17 =
  34. 34.135 + 49 =
  35. 35.348 + 19 =
  36. 36.102 + 48 =
  37. 37.240 + 77 =
  38. 38.251 + 37 =
  39. 39.174 + 97 =
  40. 40.473 + 79 =

Answer key

  1. 67
  2. 391
  3. 128
  4. 127
  5. 201
  6. 467
  7. 106
  8. 117
  9. 166
  10. 278
  11. 354
  12. 260
  13. 516
  14. 157
  15. 430
  16. 71
  17. 112
  18. 253
  19. 408
  20. 134
  21. 465
  22. 366
  23. 584
  24. 275
  25. 131
  26. 521
  27. 332
  28. 221
  29. 353
  30. 344
  31. 97
  32. 104
  33. 44
  34. 184
  35. 367
  36. 150
  37. 317
  38. 288
  39. 271
  40. 552

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