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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 107 · 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. 1.400 + 18 =
  2. 2.55 + 19 =
  3. 3.67 + 39 =
  4. 4.370 + 79 =
  5. 5.309 + 97 =
  6. 6.300 + 68 =
  7. 7.296 + 67 =
  8. 8.77 + 68 =
  9. 9.244 + 58 =
  10. 10.224 + 19 =
  11. 11.274 + 47 =
  12. 12.199 + 18 =
  13. 13.400 + 27 =
  14. 14.317 + 48 =
  15. 15.286 + 88 =
  16. 16.497 + 37 =
  17. 17.485 + 37 =
  18. 18.213 + 28 =
  19. 19.321 + 59 =
  20. 20.129 + 57 =
  21. 21.90 + 97 =
  22. 22.350 + 17 =
  23. 23.183 + 57 =
  24. 24.483 + 87 =
  25. 25.462 + 37 =
  26. 26.299 + 87 =
  27. 27.136 + 99 =
  28. 28.339 + 27 =
  29. 29.386 + 47 =
  30. 30.262 + 29 =
  31. 31.226 + 37 =
  32. 32.447 + 69 =
  33. 33.152 + 77 =
  34. 34.58 + 67 =
  35. 35.84 + 48 =
  36. 36.153 + 77 =
  37. 37.269 + 78 =
  38. 38.281 + 29 =
  39. 39.484 + 37 =
  40. 40.351 + 39 =

Answer key

  1. 418
  2. 74
  3. 106
  4. 449
  5. 406
  6. 368
  7. 363
  8. 145
  9. 302
  10. 243
  11. 321
  12. 217
  13. 427
  14. 365
  15. 374
  16. 534
  17. 522
  18. 241
  19. 380
  20. 186
  21. 187
  22. 367
  23. 240
  24. 570
  25. 499
  26. 386
  27. 235
  28. 366
  29. 433
  30. 291
  31. 263
  32. 516
  33. 229
  34. 125
  35. 132
  36. 230
  37. 347
  38. 310
  39. 521
  40. 390

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