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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 852 · 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. 1.51 + 49 =
  2. 2.145 + 88 =
  3. 3.176 + 59 =
  4. 4.450 + 88 =
  5. 5.111 + 38 =
  6. 6.124 + 59 =
  7. 7.126 + 58 =
  8. 8.57 + 27 =
  9. 9.262 + 68 =
  10. 10.288 + 58 =
  11. 11.407 + 98 =
  12. 12.31 + 98 =
  13. 13.188 + 39 =
  14. 14.477 + 37 =
  15. 15.93 + 97 =
  16. 16.238 + 99 =
  17. 17.307 + 89 =
  18. 18.247 + 19 =
  19. 19.226 + 47 =
  20. 20.314 + 77 =
  21. 21.163 + 49 =
  22. 22.463 + 69 =
  23. 23.76 + 39 =
  24. 24.275 + 99 =
  25. 25.433 + 19 =
  26. 26.127 + 87 =
  27. 27.96 + 77 =
  28. 28.87 + 27 =
  29. 29.271 + 88 =
  30. 30.155 + 38 =
  31. 31.493 + 99 =
  32. 32.200 + 48 =
  33. 33.484 + 57 =
  34. 34.397 + 37 =
  35. 35.165 + 89 =
  36. 36.199 + 17 =
  37. 37.66 + 68 =
  38. 38.74 + 19 =
  39. 39.144 + 87 =
  40. 40.139 + 69 =

Answer key

  1. 100
  2. 233
  3. 235
  4. 538
  5. 149
  6. 183
  7. 184
  8. 84
  9. 330
  10. 346
  11. 505
  12. 129
  13. 227
  14. 514
  15. 190
  16. 337
  17. 396
  18. 266
  19. 273
  20. 391
  21. 212
  22. 532
  23. 115
  24. 374
  25. 452
  26. 214
  27. 173
  28. 114
  29. 359
  30. 193
  31. 592
  32. 248
  33. 541
  34. 434
  35. 254
  36. 216
  37. 134
  38. 93
  39. 231
  40. 208

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