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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 780 · 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. 1.157 + 37 =
  2. 2.177 + 87 =
  3. 3.191 + 77 =
  4. 4.169 + 19 =
  5. 5.199 + 97 =
  6. 6.94 + 39 =
  7. 7.140 + 87 =
  8. 8.57 + 89 =
  9. 9.488 + 17 =
  10. 10.130 + 77 =
  11. 11.330 + 68 =
  12. 12.234 + 68 =
  13. 13.253 + 17 =
  14. 14.142 + 88 =
  15. 15.473 + 28 =
  16. 16.202 + 59 =
  17. 17.331 + 19 =
  18. 18.70 + 99 =
  19. 19.299 + 58 =
  20. 20.50 + 58 =
  21. 21.423 + 19 =
  22. 22.469 + 18 =
  23. 23.455 + 59 =
  24. 24.32 + 39 =
  25. 25.303 + 89 =
  26. 26.263 + 38 =
  27. 27.349 + 37 =
  28. 28.270 + 38 =
  29. 29.370 + 39 =
  30. 30.232 + 68 =
  31. 31.140 + 17 =
  32. 32.121 + 48 =
  33. 33.243 + 69 =
  34. 34.382 + 77 =
  35. 35.54 + 37 =
  36. 36.369 + 68 =
  37. 37.29 + 27 =
  38. 38.47 + 77 =
  39. 39.157 + 17 =
  40. 40.437 + 49 =

Answer key

  1. 194
  2. 264
  3. 268
  4. 188
  5. 296
  6. 133
  7. 227
  8. 146
  9. 505
  10. 207
  11. 398
  12. 302
  13. 270
  14. 230
  15. 501
  16. 261
  17. 350
  18. 169
  19. 357
  20. 108
  21. 442
  22. 487
  23. 514
  24. 71
  25. 392
  26. 301
  27. 386
  28. 308
  29. 409
  30. 300
  31. 157
  32. 169
  33. 312
  34. 459
  35. 91
  36. 437
  37. 56
  38. 124
  39. 174
  40. 486

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