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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 695 · 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. 1.160 + 28 =
  2. 2.208 + 39 =
  3. 3.271 + 69 =
  4. 4.110 + 27 =
  5. 5.269 + 38 =
  6. 6.383 + 88 =
  7. 7.424 + 59 =
  8. 8.238 + 67 =
  9. 9.56 + 67 =
  10. 10.132 + 89 =
  11. 11.214 + 98 =
  12. 12.372 + 27 =
  13. 13.170 + 69 =
  14. 14.380 + 19 =
  15. 15.272 + 38 =
  16. 16.275 + 79 =
  17. 17.70 + 69 =
  18. 18.429 + 17 =
  19. 19.53 + 29 =
  20. 20.81 + 19 =
  21. 21.273 + 19 =
  22. 22.374 + 18 =
  23. 23.367 + 79 =
  24. 24.208 + 57 =
  25. 25.357 + 78 =
  26. 26.311 + 58 =
  27. 27.491 + 99 =
  28. 28.357 + 59 =
  29. 29.159 + 29 =
  30. 30.201 + 19 =
  31. 31.241 + 39 =
  32. 32.236 + 59 =
  33. 33.244 + 37 =
  34. 34.87 + 19 =
  35. 35.77 + 18 =
  36. 36.229 + 67 =
  37. 37.375 + 99 =
  38. 38.28 + 59 =
  39. 39.99 + 87 =
  40. 40.40 + 87 =

Answer key

  1. 188
  2. 247
  3. 340
  4. 137
  5. 307
  6. 471
  7. 483
  8. 305
  9. 123
  10. 221
  11. 312
  12. 399
  13. 239
  14. 399
  15. 310
  16. 354
  17. 139
  18. 446
  19. 82
  20. 100
  21. 292
  22. 392
  23. 446
  24. 265
  25. 435
  26. 369
  27. 590
  28. 416
  29. 188
  30. 220
  31. 280
  32. 295
  33. 281
  34. 106
  35. 95
  36. 296
  37. 474
  38. 87
  39. 186
  40. 127

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