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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 790 · 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. 1.288 + 28 =
  2. 2.150 + 99 =
  3. 3.75 + 57 =
  4. 4.499 + 87 =
  5. 5.424 + 57 =
  6. 6.52 + 47 =
  7. 7.375 + 48 =
  8. 8.72 + 39 =
  9. 9.69 + 87 =
  10. 10.194 + 17 =
  11. 11.209 + 37 =
  12. 12.30 + 57 =
  13. 13.244 + 27 =
  14. 14.85 + 99 =
  15. 15.56 + 78 =
  16. 16.171 + 49 =
  17. 17.284 + 69 =
  18. 18.323 + 59 =
  19. 19.305 + 39 =
  20. 20.27 + 27 =
  21. 21.297 + 27 =
  22. 22.174 + 67 =
  23. 23.194 + 47 =
  24. 24.111 + 29 =
  25. 25.102 + 17 =
  26. 26.391 + 29 =
  27. 27.455 + 88 =
  28. 28.25 + 19 =
  29. 29.109 + 47 =
  30. 30.118 + 57 =
  31. 31.287 + 79 =
  32. 32.212 + 78 =
  33. 33.26 + 37 =
  34. 34.241 + 37 =
  35. 35.50 + 79 =
  36. 36.184 + 37 =
  37. 37.91 + 48 =
  38. 38.146 + 97 =
  39. 39.466 + 87 =
  40. 40.321 + 17 =

Answer key

  1. 316
  2. 249
  3. 132
  4. 586
  5. 481
  6. 99
  7. 423
  8. 111
  9. 156
  10. 211
  11. 246
  12. 87
  13. 271
  14. 184
  15. 134
  16. 220
  17. 353
  18. 382
  19. 344
  20. 54
  21. 324
  22. 241
  23. 241
  24. 140
  25. 119
  26. 420
  27. 543
  28. 44
  29. 156
  30. 175
  31. 366
  32. 290
  33. 63
  34. 278
  35. 129
  36. 221
  37. 139
  38. 243
  39. 553
  40. 338

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