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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 262 · 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. 1.318 + 29 =
  2. 2.272 + 18 =
  3. 3.389 + 37 =
  4. 4.179 + 17 =
  5. 5.173 + 57 =
  6. 6.457 + 69 =
  7. 7.235 + 69 =
  8. 8.30 + 47 =
  9. 9.374 + 89 =
  10. 10.339 + 69 =
  11. 11.453 + 77 =
  12. 12.144 + 89 =
  13. 13.95 + 49 =
  14. 14.462 + 27 =
  15. 15.30 + 59 =
  16. 16.204 + 18 =
  17. 17.354 + 27 =
  18. 18.313 + 97 =
  19. 19.144 + 38 =
  20. 20.176 + 99 =
  21. 21.121 + 89 =
  22. 22.150 + 59 =
  23. 23.246 + 59 =
  24. 24.219 + 49 =
  25. 25.64 + 68 =
  26. 26.140 + 99 =
  27. 27.45 + 37 =
  28. 28.440 + 27 =
  29. 29.352 + 47 =
  30. 30.332 + 37 =
  31. 31.367 + 38 =
  32. 32.232 + 27 =
  33. 33.28 + 28 =
  34. 34.142 + 58 =
  35. 35.190 + 67 =
  36. 36.275 + 57 =
  37. 37.325 + 37 =
  38. 38.157 + 67 =
  39. 39.154 + 97 =
  40. 40.112 + 29 =

Answer key

  1. 347
  2. 290
  3. 426
  4. 196
  5. 230
  6. 526
  7. 304
  8. 77
  9. 463
  10. 408
  11. 530
  12. 233
  13. 144
  14. 489
  15. 89
  16. 222
  17. 381
  18. 410
  19. 182
  20. 275
  21. 210
  22. 209
  23. 305
  24. 268
  25. 132
  26. 239
  27. 82
  28. 467
  29. 399
  30. 369
  31. 405
  32. 259
  33. 56
  34. 200
  35. 257
  36. 332
  37. 362
  38. 224
  39. 251
  40. 141

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