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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 422 · 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. 1.392 + 77 =
  2. 2.372 + 68 =
  3. 3.216 + 49 =
  4. 4.196 + 58 =
  5. 5.349 + 99 =
  6. 6.283 + 98 =
  7. 7.202 + 38 =
  8. 8.438 + 38 =
  9. 9.431 + 69 =
  10. 10.43 + 88 =
  11. 11.319 + 19 =
  12. 12.450 + 78 =
  13. 13.154 + 67 =
  14. 14.367 + 69 =
  15. 15.303 + 59 =
  16. 16.169 + 29 =
  17. 17.317 + 99 =
  18. 18.335 + 87 =
  19. 19.380 + 47 =
  20. 20.493 + 87 =
  21. 21.269 + 67 =
  22. 22.127 + 99 =
  23. 23.113 + 38 =
  24. 24.412 + 28 =
  25. 25.74 + 98 =
  26. 26.478 + 78 =
  27. 27.153 + 38 =
  28. 28.385 + 37 =
  29. 29.386 + 67 =
  30. 30.145 + 67 =
  31. 31.391 + 88 =
  32. 32.371 + 78 =
  33. 33.411 + 69 =
  34. 34.418 + 87 =
  35. 35.290 + 27 =
  36. 36.229 + 97 =
  37. 37.349 + 18 =
  38. 38.264 + 29 =
  39. 39.393 + 78 =
  40. 40.45 + 57 =

Answer key

  1. 469
  2. 440
  3. 265
  4. 254
  5. 448
  6. 381
  7. 240
  8. 476
  9. 500
  10. 131
  11. 338
  12. 528
  13. 221
  14. 436
  15. 362
  16. 198
  17. 416
  18. 422
  19. 427
  20. 580
  21. 336
  22. 226
  23. 151
  24. 440
  25. 172
  26. 556
  27. 191
  28. 422
  29. 453
  30. 212
  31. 479
  32. 449
  33. 480
  34. 505
  35. 317
  36. 326
  37. 367
  38. 293
  39. 471
  40. 102

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