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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 797 · 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. 1.141 + 59 =
  2. 2.155 + 57 =
  3. 3.42 + 69 =
  4. 4.205 + 18 =
  5. 5.137 + 38 =
  6. 6.484 + 28 =
  7. 7.394 + 48 =
  8. 8.171 + 67 =
  9. 9.370 + 98 =
  10. 10.416 + 49 =
  11. 11.74 + 29 =
  12. 12.274 + 67 =
  13. 13.204 + 97 =
  14. 14.192 + 99 =
  15. 15.386 + 67 =
  16. 16.366 + 97 =
  17. 17.133 + 17 =
  18. 18.83 + 89 =
  19. 19.265 + 77 =
  20. 20.56 + 79 =
  21. 21.445 + 89 =
  22. 22.183 + 97 =
  23. 23.81 + 88 =
  24. 24.475 + 29 =
  25. 25.439 + 68 =
  26. 26.154 + 99 =
  27. 27.81 + 17 =
  28. 28.387 + 28 =
  29. 29.357 + 67 =
  30. 30.111 + 59 =
  31. 31.362 + 67 =
  32. 32.262 + 29 =
  33. 33.292 + 18 =
  34. 34.240 + 48 =
  35. 35.107 + 98 =
  36. 36.281 + 28 =
  37. 37.192 + 89 =
  38. 38.479 + 59 =
  39. 39.37 + 19 =
  40. 40.90 + 17 =

Answer key

  1. 200
  2. 212
  3. 111
  4. 223
  5. 175
  6. 512
  7. 442
  8. 238
  9. 468
  10. 465
  11. 103
  12. 341
  13. 301
  14. 291
  15. 453
  16. 463
  17. 150
  18. 172
  19. 342
  20. 135
  21. 534
  22. 280
  23. 169
  24. 504
  25. 507
  26. 253
  27. 98
  28. 415
  29. 424
  30. 170
  31. 429
  32. 291
  33. 310
  34. 288
  35. 205
  36. 309
  37. 281
  38. 538
  39. 56
  40. 107

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