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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 190 · 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. 1.108 + 67 =
  2. 2.292 + 67 =
  3. 3.296 + 79 =
  4. 4.314 + 58 =
  5. 5.343 + 47 =
  6. 6.266 + 39 =
  7. 7.254 + 47 =
  8. 8.430 + 49 =
  9. 9.363 + 27 =
  10. 10.144 + 99 =
  11. 11.121 + 88 =
  12. 12.486 + 17 =
  13. 13.77 + 29 =
  14. 14.425 + 87 =
  15. 15.339 + 39 =
  16. 16.156 + 28 =
  17. 17.478 + 97 =
  18. 18.409 + 68 =
  19. 19.362 + 58 =
  20. 20.496 + 49 =
  21. 21.230 + 27 =
  22. 22.441 + 57 =
  23. 23.174 + 17 =
  24. 24.70 + 58 =
  25. 25.352 + 57 =
  26. 26.43 + 67 =
  27. 27.322 + 37 =
  28. 28.201 + 38 =
  29. 29.93 + 48 =
  30. 30.127 + 77 =
  31. 31.411 + 88 =
  32. 32.321 + 68 =
  33. 33.165 + 39 =
  34. 34.255 + 19 =
  35. 35.74 + 69 =
  36. 36.305 + 58 =
  37. 37.234 + 87 =
  38. 38.191 + 29 =
  39. 39.334 + 17 =
  40. 40.176 + 59 =

Answer key

  1. 175
  2. 359
  3. 375
  4. 372
  5. 390
  6. 305
  7. 301
  8. 479
  9. 390
  10. 243
  11. 209
  12. 503
  13. 106
  14. 512
  15. 378
  16. 184
  17. 575
  18. 477
  19. 420
  20. 545
  21. 257
  22. 498
  23. 191
  24. 128
  25. 409
  26. 110
  27. 359
  28. 239
  29. 141
  30. 204
  31. 499
  32. 389
  33. 204
  34. 274
  35. 143
  36. 363
  37. 321
  38. 220
  39. 351
  40. 235

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