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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 925 · 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. 1.200 + 97 =
  2. 2.356 + 28 =
  3. 3.395 + 58 =
  4. 4.206 + 59 =
  5. 5.74 + 57 =
  6. 6.197 + 78 =
  7. 7.487 + 19 =
  8. 8.185 + 39 =
  9. 9.303 + 29 =
  10. 10.209 + 17 =
  11. 11.360 + 78 =
  12. 12.470 + 29 =
  13. 13.164 + 28 =
  14. 14.243 + 87 =
  15. 15.292 + 28 =
  16. 16.199 + 48 =
  17. 17.77 + 79 =
  18. 18.356 + 89 =
  19. 19.359 + 59 =
  20. 20.353 + 37 =
  21. 21.229 + 59 =
  22. 22.143 + 28 =
  23. 23.220 + 29 =
  24. 24.83 + 57 =
  25. 25.117 + 89 =
  26. 26.112 + 79 =
  27. 27.100 + 68 =
  28. 28.476 + 47 =
  29. 29.117 + 57 =
  30. 30.169 + 49 =
  31. 31.62 + 89 =
  32. 32.422 + 98 =
  33. 33.469 + 79 =
  34. 34.165 + 88 =
  35. 35.279 + 28 =
  36. 36.244 + 48 =
  37. 37.396 + 89 =
  38. 38.232 + 19 =
  39. 39.147 + 19 =
  40. 40.479 + 19 =

Answer key

  1. 297
  2. 384
  3. 453
  4. 265
  5. 131
  6. 275
  7. 506
  8. 224
  9. 332
  10. 226
  11. 438
  12. 499
  13. 192
  14. 330
  15. 320
  16. 247
  17. 156
  18. 445
  19. 418
  20. 390
  21. 288
  22. 171
  23. 249
  24. 140
  25. 206
  26. 191
  27. 168
  28. 523
  29. 174
  30. 218
  31. 151
  32. 520
  33. 548
  34. 253
  35. 307
  36. 292
  37. 485
  38. 251
  39. 166
  40. 498

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