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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 277 · 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. 1.270 + 97 =
  2. 2.253 + 99 =
  3. 3.483 + 97 =
  4. 4.143 + 27 =
  5. 5.364 + 58 =
  6. 6.111 + 67 =
  7. 7.77 + 69 =
  8. 8.456 + 78 =
  9. 9.162 + 69 =
  10. 10.64 + 27 =
  11. 11.114 + 27 =
  12. 12.76 + 69 =
  13. 13.407 + 47 =
  14. 14.150 + 18 =
  15. 15.294 + 18 =
  16. 16.158 + 39 =
  17. 17.173 + 59 =
  18. 18.312 + 88 =
  19. 19.387 + 79 =
  20. 20.345 + 59 =
  21. 21.233 + 48 =
  22. 22.325 + 49 =
  23. 23.429 + 57 =
  24. 24.366 + 28 =
  25. 25.186 + 17 =
  26. 26.235 + 68 =
  27. 27.425 + 99 =
  28. 28.483 + 27 =
  29. 29.155 + 68 =
  30. 30.320 + 47 =
  31. 31.387 + 47 =
  32. 32.207 + 59 =
  33. 33.154 + 48 =
  34. 34.193 + 88 =
  35. 35.456 + 47 =
  36. 36.177 + 99 =
  37. 37.138 + 68 =
  38. 38.392 + 78 =
  39. 39.208 + 68 =
  40. 40.149 + 28 =

Answer key

  1. 367
  2. 352
  3. 580
  4. 170
  5. 422
  6. 178
  7. 146
  8. 534
  9. 231
  10. 91
  11. 141
  12. 145
  13. 454
  14. 168
  15. 312
  16. 197
  17. 232
  18. 400
  19. 466
  20. 404
  21. 281
  22. 374
  23. 486
  24. 394
  25. 203
  26. 303
  27. 524
  28. 510
  29. 223
  30. 367
  31. 434
  32. 266
  33. 202
  34. 281
  35. 503
  36. 276
  37. 206
  38. 470
  39. 276
  40. 177

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