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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 184 · 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. 1.483 + 17 =
  2. 2.160 + 28 =
  3. 3.190 + 77 =
  4. 4.250 + 87 =
  5. 5.226 + 17 =
  6. 6.398 + 17 =
  7. 7.123 + 38 =
  8. 8.301 + 27 =
  9. 9.463 + 69 =
  10. 10.421 + 39 =
  11. 11.355 + 99 =
  12. 12.486 + 17 =
  13. 13.127 + 89 =
  14. 14.331 + 59 =
  15. 15.199 + 17 =
  16. 16.41 + 57 =
  17. 17.211 + 19 =
  18. 18.95 + 79 =
  19. 19.186 + 48 =
  20. 20.197 + 39 =
  21. 21.130 + 99 =
  22. 22.330 + 69 =
  23. 23.131 + 47 =
  24. 24.420 + 67 =
  25. 25.395 + 87 =
  26. 26.288 + 29 =
  27. 27.255 + 77 =
  28. 28.177 + 78 =
  29. 29.100 + 39 =
  30. 30.269 + 67 =
  31. 31.28 + 28 =
  32. 32.460 + 18 =
  33. 33.69 + 27 =
  34. 34.125 + 77 =
  35. 35.437 + 57 =
  36. 36.262 + 18 =
  37. 37.191 + 29 =
  38. 38.249 + 18 =
  39. 39.188 + 17 =
  40. 40.461 + 29 =

Answer key

  1. 500
  2. 188
  3. 267
  4. 337
  5. 243
  6. 415
  7. 161
  8. 328
  9. 532
  10. 460
  11. 454
  12. 503
  13. 216
  14. 390
  15. 216
  16. 98
  17. 230
  18. 174
  19. 234
  20. 236
  21. 229
  22. 399
  23. 178
  24. 487
  25. 482
  26. 317
  27. 332
  28. 255
  29. 139
  30. 336
  31. 56
  32. 478
  33. 96
  34. 202
  35. 494
  36. 280
  37. 220
  38. 267
  39. 205
  40. 490

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