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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 929 · 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. 1.206 + 98 =
  2. 2.87 + 78 =
  3. 3.385 + 17 =
  4. 4.199 + 97 =
  5. 5.496 + 39 =
  6. 6.287 + 28 =
  7. 7.59 + 99 =
  8. 8.154 + 77 =
  9. 9.160 + 77 =
  10. 10.469 + 77 =
  11. 11.182 + 29 =
  12. 12.67 + 68 =
  13. 13.39 + 88 =
  14. 14.319 + 17 =
  15. 15.334 + 48 =
  16. 16.263 + 18 =
  17. 17.215 + 48 =
  18. 18.219 + 89 =
  19. 19.469 + 59 =
  20. 20.374 + 47 =
  21. 21.295 + 59 =
  22. 22.488 + 57 =
  23. 23.202 + 37 =
  24. 24.367 + 78 =
  25. 25.343 + 19 =
  26. 26.115 + 28 =
  27. 27.176 + 87 =
  28. 28.50 + 19 =
  29. 29.80 + 49 =
  30. 30.173 + 99 =
  31. 31.174 + 99 =
  32. 32.310 + 19 =
  33. 33.484 + 87 =
  34. 34.190 + 19 =
  35. 35.402 + 17 =
  36. 36.61 + 98 =
  37. 37.485 + 47 =
  38. 38.171 + 67 =
  39. 39.70 + 17 =
  40. 40.247 + 98 =

Answer key

  1. 304
  2. 165
  3. 402
  4. 296
  5. 535
  6. 315
  7. 158
  8. 231
  9. 237
  10. 546
  11. 211
  12. 135
  13. 127
  14. 336
  15. 382
  16. 281
  17. 263
  18. 308
  19. 528
  20. 421
  21. 354
  22. 545
  23. 239
  24. 445
  25. 362
  26. 143
  27. 263
  28. 69
  29. 129
  30. 272
  31. 273
  32. 329
  33. 571
  34. 209
  35. 419
  36. 159
  37. 532
  38. 238
  39. 87
  40. 345

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