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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 587 · 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. 1.417 + 37 =
  2. 2.142 + 37 =
  3. 3.391 + 77 =
  4. 4.456 + 78 =
  5. 5.480 + 38 =
  6. 6.497 + 17 =
  7. 7.77 + 97 =
  8. 8.64 + 17 =
  9. 9.116 + 78 =
  10. 10.89 + 17 =
  11. 11.271 + 99 =
  12. 12.157 + 77 =
  13. 13.338 + 48 =
  14. 14.149 + 79 =
  15. 15.245 + 69 =
  16. 16.32 + 67 =
  17. 17.160 + 78 =
  18. 18.326 + 98 =
  19. 19.61 + 39 =
  20. 20.249 + 27 =
  21. 21.218 + 89 =
  22. 22.342 + 89 =
  23. 23.133 + 78 =
  24. 24.31 + 79 =
  25. 25.321 + 97 =
  26. 26.81 + 87 =
  27. 27.386 + 59 =
  28. 28.359 + 98 =
  29. 29.336 + 87 =
  30. 30.181 + 28 =
  31. 31.345 + 27 =
  32. 32.145 + 69 =
  33. 33.377 + 58 =
  34. 34.126 + 47 =
  35. 35.128 + 68 =
  36. 36.468 + 38 =
  37. 37.405 + 48 =
  38. 38.194 + 39 =
  39. 39.134 + 18 =
  40. 40.384 + 27 =

Answer key

  1. 454
  2. 179
  3. 468
  4. 534
  5. 518
  6. 514
  7. 174
  8. 81
  9. 194
  10. 106
  11. 370
  12. 234
  13. 386
  14. 228
  15. 314
  16. 99
  17. 238
  18. 424
  19. 100
  20. 276
  21. 307
  22. 431
  23. 211
  24. 110
  25. 418
  26. 168
  27. 445
  28. 457
  29. 423
  30. 209
  31. 372
  32. 214
  33. 435
  34. 173
  35. 196
  36. 506
  37. 453
  38. 233
  39. 152
  40. 411

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