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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 317 · 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. 1.92 + 69 =
  2. 2.54 + 39 =
  3. 3.122 + 49 =
  4. 4.456 + 98 =
  5. 5.210 + 17 =
  6. 6.32 + 99 =
  7. 7.286 + 49 =
  8. 8.70 + 19 =
  9. 9.196 + 89 =
  10. 10.129 + 97 =
  11. 11.260 + 27 =
  12. 12.60 + 98 =
  13. 13.119 + 37 =
  14. 14.330 + 48 =
  15. 15.156 + 67 =
  16. 16.344 + 77 =
  17. 17.302 + 29 =
  18. 18.254 + 17 =
  19. 19.168 + 37 =
  20. 20.140 + 29 =
  21. 21.331 + 99 =
  22. 22.45 + 88 =
  23. 23.295 + 17 =
  24. 24.157 + 17 =
  25. 25.440 + 28 =
  26. 26.444 + 48 =
  27. 27.101 + 59 =
  28. 28.450 + 99 =
  29. 29.40 + 58 =
  30. 30.447 + 88 =
  31. 31.299 + 68 =
  32. 32.219 + 28 =
  33. 33.415 + 59 =
  34. 34.348 + 47 =
  35. 35.187 + 87 =
  36. 36.106 + 49 =
  37. 37.116 + 48 =
  38. 38.173 + 57 =
  39. 39.112 + 69 =
  40. 40.81 + 77 =

Answer key

  1. 161
  2. 93
  3. 171
  4. 554
  5. 227
  6. 131
  7. 335
  8. 89
  9. 285
  10. 226
  11. 287
  12. 158
  13. 156
  14. 378
  15. 223
  16. 421
  17. 331
  18. 271
  19. 205
  20. 169
  21. 430
  22. 133
  23. 312
  24. 174
  25. 468
  26. 492
  27. 160
  28. 549
  29. 98
  30. 535
  31. 367
  32. 247
  33. 474
  34. 395
  35. 274
  36. 155
  37. 164
  38. 230
  39. 181
  40. 158

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