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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 367 · 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. 1.378 + 48 =
  2. 2.190 + 98 =
  3. 3.86 + 49 =
  4. 4.333 + 89 =
  5. 5.230 + 17 =
  6. 6.348 + 99 =
  7. 7.376 + 29 =
  8. 8.444 + 47 =
  9. 9.67 + 29 =
  10. 10.141 + 38 =
  11. 11.291 + 98 =
  12. 12.224 + 69 =
  13. 13.63 + 97 =
  14. 14.463 + 37 =
  15. 15.357 + 38 =
  16. 16.285 + 38 =
  17. 17.489 + 67 =
  18. 18.62 + 49 =
  19. 19.102 + 67 =
  20. 20.361 + 28 =
  21. 21.286 + 17 =
  22. 22.301 + 39 =
  23. 23.131 + 17 =
  24. 24.264 + 79 =
  25. 25.437 + 19 =
  26. 26.348 + 68 =
  27. 27.441 + 79 =
  28. 28.475 + 38 =
  29. 29.97 + 17 =
  30. 30.302 + 88 =
  31. 31.128 + 27 =
  32. 32.76 + 87 =
  33. 33.354 + 58 =
  34. 34.355 + 89 =
  35. 35.141 + 49 =
  36. 36.160 + 68 =
  37. 37.170 + 77 =
  38. 38.340 + 48 =
  39. 39.36 + 78 =
  40. 40.365 + 97 =

Answer key

  1. 426
  2. 288
  3. 135
  4. 422
  5. 247
  6. 447
  7. 405
  8. 491
  9. 96
  10. 179
  11. 389
  12. 293
  13. 160
  14. 500
  15. 395
  16. 323
  17. 556
  18. 111
  19. 169
  20. 389
  21. 303
  22. 340
  23. 148
  24. 343
  25. 456
  26. 416
  27. 520
  28. 513
  29. 114
  30. 390
  31. 155
  32. 163
  33. 412
  34. 444
  35. 190
  36. 228
  37. 247
  38. 388
  39. 114
  40. 462

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