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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 170 · 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. 1.301 + 79 =
  2. 2.71 + 18 =
  3. 3.152 + 37 =
  4. 4.117 + 38 =
  5. 5.405 + 67 =
  6. 6.346 + 28 =
  7. 7.160 + 97 =
  8. 8.395 + 29 =
  9. 9.95 + 89 =
  10. 10.98 + 49 =
  11. 11.155 + 18 =
  12. 12.213 + 48 =
  13. 13.145 + 69 =
  14. 14.288 + 27 =
  15. 15.196 + 89 =
  16. 16.395 + 47 =
  17. 17.363 + 19 =
  18. 18.154 + 78 =
  19. 19.101 + 59 =
  20. 20.205 + 39 =
  21. 21.489 + 68 =
  22. 22.253 + 37 =
  23. 23.162 + 68 =
  24. 24.307 + 79 =
  25. 25.51 + 69 =
  26. 26.251 + 28 =
  27. 27.161 + 17 =
  28. 28.90 + 58 =
  29. 29.305 + 29 =
  30. 30.380 + 28 =
  31. 31.337 + 68 =
  32. 32.177 + 57 =
  33. 33.413 + 57 =
  34. 34.44 + 88 =
  35. 35.419 + 39 =
  36. 36.215 + 29 =
  37. 37.106 + 79 =
  38. 38.344 + 89 =
  39. 39.47 + 18 =
  40. 40.481 + 38 =

Answer key

  1. 380
  2. 89
  3. 189
  4. 155
  5. 472
  6. 374
  7. 257
  8. 424
  9. 184
  10. 147
  11. 173
  12. 261
  13. 214
  14. 315
  15. 285
  16. 442
  17. 382
  18. 232
  19. 160
  20. 244
  21. 557
  22. 290
  23. 230
  24. 386
  25. 120
  26. 279
  27. 178
  28. 148
  29. 334
  30. 408
  31. 405
  32. 234
  33. 470
  34. 132
  35. 458
  36. 244
  37. 185
  38. 433
  39. 65
  40. 519

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