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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 356 · 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. 1.145 + 99 =
  2. 2.32 + 47 =
  3. 3.168 + 99 =
  4. 4.253 + 37 =
  5. 5.176 + 47 =
  6. 6.158 + 99 =
  7. 7.212 + 29 =
  8. 8.459 + 48 =
  9. 9.442 + 57 =
  10. 10.48 + 97 =
  11. 11.258 + 38 =
  12. 12.342 + 89 =
  13. 13.117 + 69 =
  14. 14.422 + 78 =
  15. 15.219 + 97 =
  16. 16.305 + 97 =
  17. 17.345 + 29 =
  18. 18.265 + 69 =
  19. 19.343 + 87 =
  20. 20.346 + 68 =
  21. 21.269 + 58 =
  22. 22.64 + 17 =
  23. 23.386 + 29 =
  24. 24.450 + 79 =
  25. 25.76 + 88 =
  26. 26.71 + 98 =
  27. 27.363 + 88 =
  28. 28.486 + 77 =
  29. 29.484 + 77 =
  30. 30.220 + 28 =
  31. 31.155 + 48 =
  32. 32.196 + 29 =
  33. 33.47 + 79 =
  34. 34.98 + 97 =
  35. 35.175 + 78 =
  36. 36.268 + 48 =
  37. 37.33 + 87 =
  38. 38.214 + 17 =
  39. 39.271 + 99 =
  40. 40.127 + 28 =

Answer key

  1. 244
  2. 79
  3. 267
  4. 290
  5. 223
  6. 257
  7. 241
  8. 507
  9. 499
  10. 145
  11. 296
  12. 431
  13. 186
  14. 500
  15. 316
  16. 402
  17. 374
  18. 334
  19. 430
  20. 414
  21. 327
  22. 81
  23. 415
  24. 529
  25. 164
  26. 169
  27. 451
  28. 563
  29. 561
  30. 248
  31. 203
  32. 225
  33. 126
  34. 195
  35. 253
  36. 316
  37. 120
  38. 231
  39. 370
  40. 155

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