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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 226 · 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. 1.445 + 49 =
  2. 2.489 + 79 =
  3. 3.298 + 17 =
  4. 4.145 + 98 =
  5. 5.42 + 77 =
  6. 6.318 + 78 =
  7. 7.33 + 28 =
  8. 8.35 + 77 =
  9. 9.55 + 27 =
  10. 10.431 + 37 =
  11. 11.127 + 79 =
  12. 12.390 + 38 =
  13. 13.312 + 18 =
  14. 14.149 + 57 =
  15. 15.191 + 59 =
  16. 16.224 + 79 =
  17. 17.42 + 99 =
  18. 18.377 + 79 =
  19. 19.117 + 38 =
  20. 20.327 + 19 =
  21. 21.231 + 98 =
  22. 22.475 + 18 =
  23. 23.150 + 17 =
  24. 24.109 + 68 =
  25. 25.312 + 59 =
  26. 26.434 + 79 =
  27. 27.275 + 98 =
  28. 28.46 + 88 =
  29. 29.167 + 78 =
  30. 30.214 + 67 =
  31. 31.149 + 47 =
  32. 32.108 + 68 =
  33. 33.220 + 17 =
  34. 34.192 + 99 =
  35. 35.109 + 69 =
  36. 36.124 + 89 =
  37. 37.53 + 99 =
  38. 38.420 + 99 =
  39. 39.259 + 78 =
  40. 40.493 + 19 =

Answer key

  1. 494
  2. 568
  3. 315
  4. 243
  5. 119
  6. 396
  7. 61
  8. 112
  9. 82
  10. 468
  11. 206
  12. 428
  13. 330
  14. 206
  15. 250
  16. 303
  17. 141
  18. 456
  19. 155
  20. 346
  21. 329
  22. 493
  23. 167
  24. 177
  25. 371
  26. 513
  27. 373
  28. 134
  29. 245
  30. 281
  31. 196
  32. 176
  33. 237
  34. 291
  35. 178
  36. 213
  37. 152
  38. 519
  39. 337
  40. 512

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