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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 61 · 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. 1.87 + 69 =
  2. 2.133 + 27 =
  3. 3.103 + 57 =
  4. 4.453 + 39 =
  5. 5.194 + 37 =
  6. 6.248 + 49 =
  7. 7.375 + 47 =
  8. 8.175 + 68 =
  9. 9.200 + 59 =
  10. 10.31 + 78 =
  11. 11.343 + 97 =
  12. 12.458 + 17 =
  13. 13.29 + 67 =
  14. 14.80 + 47 =
  15. 15.470 + 19 =
  16. 16.385 + 37 =
  17. 17.240 + 69 =
  18. 18.376 + 38 =
  19. 19.494 + 77 =
  20. 20.197 + 98 =
  21. 21.98 + 37 =
  22. 22.253 + 29 =
  23. 23.126 + 29 =
  24. 24.218 + 69 =
  25. 25.209 + 49 =
  26. 26.256 + 47 =
  27. 27.105 + 88 =
  28. 28.110 + 17 =
  29. 29.222 + 57 =
  30. 30.105 + 77 =
  31. 31.234 + 49 =
  32. 32.342 + 18 =
  33. 33.104 + 27 =
  34. 34.111 + 17 =
  35. 35.302 + 58 =
  36. 36.349 + 37 =
  37. 37.300 + 87 =
  38. 38.135 + 17 =
  39. 39.497 + 27 =
  40. 40.230 + 59 =

Answer key

  1. 156
  2. 160
  3. 160
  4. 492
  5. 231
  6. 297
  7. 422
  8. 243
  9. 259
  10. 109
  11. 440
  12. 475
  13. 96
  14. 127
  15. 489
  16. 422
  17. 309
  18. 414
  19. 571
  20. 295
  21. 135
  22. 282
  23. 155
  24. 287
  25. 258
  26. 303
  27. 193
  28. 127
  29. 279
  30. 182
  31. 283
  32. 360
  33. 131
  34. 128
  35. 360
  36. 386
  37. 387
  38. 152
  39. 524
  40. 289

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