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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 240 · 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. 1.384 + 59 =
  2. 2.27 + 58 =
  3. 3.444 + 47 =
  4. 4.119 + 59 =
  5. 5.188 + 58 =
  6. 6.357 + 88 =
  7. 7.362 + 98 =
  8. 8.100 + 19 =
  9. 9.335 + 97 =
  10. 10.191 + 59 =
  11. 11.457 + 78 =
  12. 12.62 + 38 =
  13. 13.115 + 17 =
  14. 14.300 + 58 =
  15. 15.271 + 48 =
  16. 16.377 + 28 =
  17. 17.419 + 67 =
  18. 18.58 + 58 =
  19. 19.48 + 69 =
  20. 20.112 + 48 =
  21. 21.255 + 39 =
  22. 22.229 + 47 =
  23. 23.147 + 39 =
  24. 24.407 + 17 =
  25. 25.445 + 39 =
  26. 26.254 + 39 =
  27. 27.458 + 77 =
  28. 28.200 + 27 =
  29. 29.29 + 37 =
  30. 30.247 + 77 =
  31. 31.232 + 99 =
  32. 32.202 + 87 =
  33. 33.234 + 69 =
  34. 34.31 + 97 =
  35. 35.449 + 88 =
  36. 36.475 + 69 =
  37. 37.96 + 98 =
  38. 38.259 + 97 =
  39. 39.381 + 47 =
  40. 40.120 + 47 =

Answer key

  1. 443
  2. 85
  3. 491
  4. 178
  5. 246
  6. 445
  7. 460
  8. 119
  9. 432
  10. 250
  11. 535
  12. 100
  13. 132
  14. 358
  15. 319
  16. 405
  17. 486
  18. 116
  19. 117
  20. 160
  21. 294
  22. 276
  23. 186
  24. 424
  25. 484
  26. 293
  27. 535
  28. 227
  29. 66
  30. 324
  31. 331
  32. 289
  33. 303
  34. 128
  35. 537
  36. 544
  37. 194
  38. 356
  39. 428
  40. 167

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