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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 654 · 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. 1.136 + 87 =
  2. 2.241 + 68 =
  3. 3.208 + 19 =
  4. 4.390 + 99 =
  5. 5.154 + 47 =
  6. 6.458 + 69 =
  7. 7.279 + 37 =
  8. 8.206 + 97 =
  9. 9.92 + 88 =
  10. 10.452 + 39 =
  11. 11.324 + 89 =
  12. 12.326 + 87 =
  13. 13.497 + 58 =
  14. 14.41 + 97 =
  15. 15.371 + 28 =
  16. 16.302 + 17 =
  17. 17.342 + 57 =
  18. 18.42 + 67 =
  19. 19.362 + 87 =
  20. 20.82 + 88 =
  21. 21.142 + 98 =
  22. 22.79 + 67 =
  23. 23.113 + 69 =
  24. 24.198 + 19 =
  25. 25.235 + 88 =
  26. 26.127 + 57 =
  27. 27.145 + 57 =
  28. 28.494 + 49 =
  29. 29.263 + 59 =
  30. 30.349 + 18 =
  31. 31.54 + 18 =
  32. 32.52 + 88 =
  33. 33.214 + 67 =
  34. 34.112 + 57 =
  35. 35.320 + 89 =
  36. 36.335 + 97 =
  37. 37.228 + 87 =
  38. 38.204 + 49 =
  39. 39.462 + 19 =
  40. 40.53 + 88 =

Answer key

  1. 223
  2. 309
  3. 227
  4. 489
  5. 201
  6. 527
  7. 316
  8. 303
  9. 180
  10. 491
  11. 413
  12. 413
  13. 555
  14. 138
  15. 399
  16. 319
  17. 399
  18. 109
  19. 449
  20. 170
  21. 240
  22. 146
  23. 182
  24. 217
  25. 323
  26. 184
  27. 202
  28. 543
  29. 322
  30. 367
  31. 72
  32. 140
  33. 281
  34. 169
  35. 409
  36. 432
  37. 315
  38. 253
  39. 481
  40. 141

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