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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 673 · 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. 1.94 + 17 =
  2. 2.179 + 29 =
  3. 3.308 + 97 =
  4. 4.73 + 39 =
  5. 5.169 + 88 =
  6. 6.183 + 77 =
  7. 7.192 + 99 =
  8. 8.66 + 38 =
  9. 9.170 + 77 =
  10. 10.148 + 39 =
  11. 11.180 + 78 =
  12. 12.141 + 68 =
  13. 13.454 + 47 =
  14. 14.433 + 17 =
  15. 15.117 + 59 =
  16. 16.90 + 37 =
  17. 17.104 + 47 =
  18. 18.181 + 19 =
  19. 19.336 + 38 =
  20. 20.478 + 99 =
  21. 21.49 + 58 =
  22. 22.258 + 19 =
  23. 23.124 + 37 =
  24. 24.259 + 37 =
  25. 25.379 + 89 =
  26. 26.226 + 29 =
  27. 27.26 + 18 =
  28. 28.132 + 18 =
  29. 29.67 + 27 =
  30. 30.237 + 88 =
  31. 31.429 + 27 =
  32. 32.382 + 59 =
  33. 33.169 + 98 =
  34. 34.188 + 59 =
  35. 35.206 + 17 =
  36. 36.102 + 57 =
  37. 37.103 + 69 =
  38. 38.493 + 38 =
  39. 39.356 + 58 =
  40. 40.68 + 49 =

Answer key

  1. 111
  2. 208
  3. 405
  4. 112
  5. 257
  6. 260
  7. 291
  8. 104
  9. 247
  10. 187
  11. 258
  12. 209
  13. 501
  14. 450
  15. 176
  16. 127
  17. 151
  18. 200
  19. 374
  20. 577
  21. 107
  22. 277
  23. 161
  24. 296
  25. 468
  26. 255
  27. 44
  28. 150
  29. 94
  30. 325
  31. 456
  32. 441
  33. 267
  34. 247
  35. 223
  36. 159
  37. 172
  38. 531
  39. 414
  40. 117

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