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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 641 · 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. 1.443 + 89 =
  2. 2.269 + 69 =
  3. 3.125 + 58 =
  4. 4.337 + 37 =
  5. 5.136 + 47 =
  6. 6.254 + 78 =
  7. 7.183 + 39 =
  8. 8.37 + 77 =
  9. 9.193 + 39 =
  10. 10.451 + 39 =
  11. 11.144 + 67 =
  12. 12.37 + 59 =
  13. 13.182 + 78 =
  14. 14.68 + 78 =
  15. 15.209 + 89 =
  16. 16.286 + 87 =
  17. 17.396 + 19 =
  18. 18.255 + 98 =
  19. 19.146 + 99 =
  20. 20.201 + 39 =
  21. 21.126 + 28 =
  22. 22.345 + 38 =
  23. 23.255 + 29 =
  24. 24.414 + 37 =
  25. 25.365 + 37 =
  26. 26.482 + 37 =
  27. 27.273 + 68 =
  28. 28.136 + 59 =
  29. 29.183 + 18 =
  30. 30.462 + 87 =
  31. 31.245 + 49 =
  32. 32.350 + 67 =
  33. 33.221 + 17 =
  34. 34.481 + 99 =
  35. 35.154 + 19 =
  36. 36.80 + 17 =
  37. 37.144 + 88 =
  38. 38.81 + 67 =
  39. 39.131 + 17 =
  40. 40.207 + 98 =

Answer key

  1. 532
  2. 338
  3. 183
  4. 374
  5. 183
  6. 332
  7. 222
  8. 114
  9. 232
  10. 490
  11. 211
  12. 96
  13. 260
  14. 146
  15. 298
  16. 373
  17. 415
  18. 353
  19. 245
  20. 240
  21. 154
  22. 383
  23. 284
  24. 451
  25. 402
  26. 519
  27. 341
  28. 195
  29. 201
  30. 549
  31. 294
  32. 417
  33. 238
  34. 580
  35. 173
  36. 97
  37. 232
  38. 148
  39. 148
  40. 305

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