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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 15 · 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. 1.76 + 77 =
  2. 2.362 + 79 =
  3. 3.141 + 67 =
  4. 4.173 + 47 =
  5. 5.180 + 58 =
  6. 6.168 + 57 =
  7. 7.497 + 67 =
  8. 8.58 + 98 =
  9. 9.129 + 18 =
  10. 10.455 + 47 =
  11. 11.361 + 88 =
  12. 12.395 + 69 =
  13. 13.242 + 27 =
  14. 14.304 + 47 =
  15. 15.346 + 77 =
  16. 16.217 + 58 =
  17. 17.240 + 77 =
  18. 18.236 + 17 =
  19. 19.257 + 78 =
  20. 20.484 + 47 =
  21. 21.390 + 29 =
  22. 22.167 + 68 =
  23. 23.54 + 67 =
  24. 24.400 + 47 =
  25. 25.276 + 37 =
  26. 26.342 + 29 =
  27. 27.187 + 57 =
  28. 28.281 + 58 =
  29. 29.311 + 18 =
  30. 30.275 + 27 =
  31. 31.472 + 87 =
  32. 32.164 + 17 =
  33. 33.363 + 57 =
  34. 34.154 + 19 =
  35. 35.196 + 47 =
  36. 36.406 + 38 =
  37. 37.384 + 58 =
  38. 38.58 + 67 =
  39. 39.446 + 58 =
  40. 40.393 + 99 =

Answer key

  1. 153
  2. 441
  3. 208
  4. 220
  5. 238
  6. 225
  7. 564
  8. 156
  9. 147
  10. 502
  11. 449
  12. 464
  13. 269
  14. 351
  15. 423
  16. 275
  17. 317
  18. 253
  19. 335
  20. 531
  21. 419
  22. 235
  23. 121
  24. 447
  25. 313
  26. 371
  27. 244
  28. 339
  29. 329
  30. 302
  31. 559
  32. 181
  33. 420
  34. 173
  35. 243
  36. 444
  37. 442
  38. 125
  39. 504
  40. 492

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