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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 8 · 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. 1.155 + 37 =
  2. 2.162 + 58 =
  3. 3.223 + 77 =
  4. 4.120 + 49 =
  5. 5.489 + 28 =
  6. 6.327 + 57 =
  7. 7.294 + 78 =
  8. 8.90 + 29 =
  9. 9.130 + 28 =
  10. 10.63 + 67 =
  11. 11.153 + 19 =
  12. 12.391 + 59 =
  13. 13.449 + 77 =
  14. 14.93 + 49 =
  15. 15.115 + 79 =
  16. 16.361 + 88 =
  17. 17.308 + 99 =
  18. 18.189 + 67 =
  19. 19.309 + 59 =
  20. 20.245 + 49 =
  21. 21.183 + 99 =
  22. 22.77 + 19 =
  23. 23.163 + 98 =
  24. 24.422 + 48 =
  25. 25.109 + 17 =
  26. 26.434 + 87 =
  27. 27.330 + 87 =
  28. 28.102 + 67 =
  29. 29.354 + 38 =
  30. 30.90 + 49 =
  31. 31.121 + 57 =
  32. 32.26 + 27 =
  33. 33.350 + 98 =
  34. 34.54 + 28 =
  35. 35.43 + 29 =
  36. 36.36 + 18 =
  37. 37.310 + 69 =
  38. 38.299 + 77 =
  39. 39.403 + 67 =
  40. 40.245 + 67 =

Answer key

  1. 192
  2. 220
  3. 300
  4. 169
  5. 517
  6. 384
  7. 372
  8. 119
  9. 158
  10. 130
  11. 172
  12. 450
  13. 526
  14. 142
  15. 194
  16. 449
  17. 407
  18. 256
  19. 368
  20. 294
  21. 282
  22. 96
  23. 261
  24. 470
  25. 126
  26. 521
  27. 417
  28. 169
  29. 392
  30. 139
  31. 178
  32. 53
  33. 448
  34. 82
  35. 72
  36. 54
  37. 379
  38. 376
  39. 470
  40. 312

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