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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 89 · 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. 1.275 + 67 =
  2. 2.55 + 27 =
  3. 3.453 + 97 =
  4. 4.107 + 87 =
  5. 5.180 + 49 =
  6. 6.439 + 47 =
  7. 7.118 + 49 =
  8. 8.103 + 78 =
  9. 9.439 + 87 =
  10. 10.165 + 58 =
  11. 11.181 + 18 =
  12. 12.253 + 18 =
  13. 13.155 + 67 =
  14. 14.138 + 49 =
  15. 15.81 + 88 =
  16. 16.424 + 28 =
  17. 17.56 + 29 =
  18. 18.127 + 79 =
  19. 19.385 + 29 =
  20. 20.422 + 57 =
  21. 21.494 + 47 =
  22. 22.71 + 88 =
  23. 23.249 + 79 =
  24. 24.335 + 77 =
  25. 25.187 + 88 =
  26. 26.488 + 27 =
  27. 27.94 + 69 =
  28. 28.100 + 18 =
  29. 29.79 + 57 =
  30. 30.193 + 27 =
  31. 31.34 + 89 =
  32. 32.109 + 87 =
  33. 33.188 + 27 =
  34. 34.124 + 17 =
  35. 35.329 + 17 =
  36. 36.143 + 17 =
  37. 37.105 + 88 =
  38. 38.498 + 29 =
  39. 39.341 + 58 =
  40. 40.97 + 58 =

Answer key

  1. 342
  2. 82
  3. 550
  4. 194
  5. 229
  6. 486
  7. 167
  8. 181
  9. 526
  10. 223
  11. 199
  12. 271
  13. 222
  14. 187
  15. 169
  16. 452
  17. 85
  18. 206
  19. 414
  20. 479
  21. 541
  22. 159
  23. 328
  24. 412
  25. 275
  26. 515
  27. 163
  28. 118
  29. 136
  30. 220
  31. 123
  32. 196
  33. 215
  34. 141
  35. 346
  36. 160
  37. 193
  38. 527
  39. 399
  40. 155

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