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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 408 · 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. 1.268 + 18 =
  2. 2.356 + 68 =
  3. 3.129 + 67 =
  4. 4.498 + 58 =
  5. 5.166 + 47 =
  6. 6.434 + 18 =
  7. 7.188 + 69 =
  8. 8.33 + 37 =
  9. 9.336 + 97 =
  10. 10.452 + 78 =
  11. 11.101 + 37 =
  12. 12.219 + 59 =
  13. 13.359 + 39 =
  14. 14.292 + 28 =
  15. 15.391 + 18 =
  16. 16.460 + 97 =
  17. 17.323 + 47 =
  18. 18.33 + 67 =
  19. 19.111 + 97 =
  20. 20.278 + 69 =
  21. 21.111 + 28 =
  22. 22.184 + 37 =
  23. 23.182 + 48 =
  24. 24.114 + 18 =
  25. 25.67 + 99 =
  26. 26.252 + 37 =
  27. 27.53 + 88 =
  28. 28.175 + 98 =
  29. 29.54 + 17 =
  30. 30.497 + 17 =
  31. 31.46 + 57 =
  32. 32.47 + 99 =
  33. 33.91 + 78 =
  34. 34.329 + 57 =
  35. 35.219 + 78 =
  36. 36.121 + 29 =
  37. 37.170 + 17 =
  38. 38.217 + 59 =
  39. 39.360 + 47 =
  40. 40.428 + 17 =

Answer key

  1. 286
  2. 424
  3. 196
  4. 556
  5. 213
  6. 452
  7. 257
  8. 70
  9. 433
  10. 530
  11. 138
  12. 278
  13. 398
  14. 320
  15. 409
  16. 557
  17. 370
  18. 100
  19. 208
  20. 347
  21. 139
  22. 221
  23. 230
  24. 132
  25. 166
  26. 289
  27. 141
  28. 273
  29. 71
  30. 514
  31. 103
  32. 146
  33. 169
  34. 386
  35. 297
  36. 150
  37. 187
  38. 276
  39. 407
  40. 445

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