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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 147 · 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. 1.423 + 37 =
  2. 2.30 + 27 =
  3. 3.63 + 78 =
  4. 4.271 + 98 =
  5. 5.387 + 38 =
  6. 6.469 + 18 =
  7. 7.53 + 67 =
  8. 8.270 + 17 =
  9. 9.98 + 27 =
  10. 10.316 + 29 =
  11. 11.136 + 19 =
  12. 12.109 + 68 =
  13. 13.358 + 59 =
  14. 14.346 + 78 =
  15. 15.66 + 57 =
  16. 16.315 + 58 =
  17. 17.171 + 69 =
  18. 18.446 + 78 =
  19. 19.64 + 18 =
  20. 20.131 + 97 =
  21. 21.262 + 77 =
  22. 22.420 + 97 =
  23. 23.143 + 87 =
  24. 24.386 + 89 =
  25. 25.191 + 68 =
  26. 26.29 + 48 =
  27. 27.243 + 17 =
  28. 28.463 + 58 =
  29. 29.442 + 89 =
  30. 30.201 + 48 =
  31. 31.28 + 17 =
  32. 32.250 + 57 =
  33. 33.292 + 67 =
  34. 34.102 + 59 =
  35. 35.358 + 29 =
  36. 36.314 + 69 =
  37. 37.98 + 27 =
  38. 38.276 + 47 =
  39. 39.310 + 69 =
  40. 40.377 + 99 =

Answer key

  1. 460
  2. 57
  3. 141
  4. 369
  5. 425
  6. 487
  7. 120
  8. 287
  9. 125
  10. 345
  11. 155
  12. 177
  13. 417
  14. 424
  15. 123
  16. 373
  17. 240
  18. 524
  19. 82
  20. 228
  21. 339
  22. 517
  23. 230
  24. 475
  25. 259
  26. 77
  27. 260
  28. 521
  29. 531
  30. 249
  31. 45
  32. 307
  33. 359
  34. 161
  35. 387
  36. 383
  37. 125
  38. 323
  39. 379
  40. 476

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