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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 752 · 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. 1.393 + 29 =
  2. 2.489 + 88 =
  3. 3.205 + 57 =
  4. 4.26 + 98 =
  5. 5.281 + 67 =
  6. 6.198 + 97 =
  7. 7.167 + 29 =
  8. 8.236 + 68 =
  9. 9.386 + 88 =
  10. 10.328 + 57 =
  11. 11.152 + 38 =
  12. 12.322 + 38 =
  13. 13.157 + 69 =
  14. 14.486 + 47 =
  15. 15.445 + 19 =
  16. 16.93 + 87 =
  17. 17.335 + 87 =
  18. 18.265 + 98 =
  19. 19.102 + 47 =
  20. 20.129 + 87 =
  21. 21.334 + 28 =
  22. 22.352 + 58 =
  23. 23.247 + 88 =
  24. 24.420 + 28 =
  25. 25.383 + 27 =
  26. 26.261 + 98 =
  27. 27.158 + 47 =
  28. 28.110 + 58 =
  29. 29.341 + 77 =
  30. 30.332 + 98 =
  31. 31.426 + 58 =
  32. 32.74 + 29 =
  33. 33.133 + 28 =
  34. 34.347 + 88 =
  35. 35.33 + 27 =
  36. 36.49 + 99 =
  37. 37.145 + 18 =
  38. 38.272 + 18 =
  39. 39.54 + 59 =
  40. 40.127 + 79 =

Answer key

  1. 422
  2. 577
  3. 262
  4. 124
  5. 348
  6. 295
  7. 196
  8. 304
  9. 474
  10. 385
  11. 190
  12. 360
  13. 226
  14. 533
  15. 464
  16. 180
  17. 422
  18. 363
  19. 149
  20. 216
  21. 362
  22. 410
  23. 335
  24. 448
  25. 410
  26. 359
  27. 205
  28. 168
  29. 418
  30. 430
  31. 484
  32. 103
  33. 161
  34. 435
  35. 60
  36. 148
  37. 163
  38. 290
  39. 113
  40. 206

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