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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 443 · 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. 1.238 + 48 =
  2. 2.55 + 17 =
  3. 3.248 + 17 =
  4. 4.128 + 37 =
  5. 5.494 + 78 =
  6. 6.492 + 19 =
  7. 7.178 + 69 =
  8. 8.316 + 69 =
  9. 9.211 + 58 =
  10. 10.400 + 77 =
  11. 11.150 + 89 =
  12. 12.131 + 77 =
  13. 13.411 + 48 =
  14. 14.265 + 59 =
  15. 15.453 + 17 =
  16. 16.188 + 47 =
  17. 17.54 + 28 =
  18. 18.127 + 77 =
  19. 19.327 + 58 =
  20. 20.457 + 18 =
  21. 21.48 + 78 =
  22. 22.307 + 28 =
  23. 23.142 + 78 =
  24. 24.459 + 19 =
  25. 25.216 + 58 =
  26. 26.49 + 29 =
  27. 27.464 + 99 =
  28. 28.140 + 28 =
  29. 29.55 + 97 =
  30. 30.198 + 48 =
  31. 31.28 + 39 =
  32. 32.480 + 88 =
  33. 33.482 + 47 =
  34. 34.454 + 37 =
  35. 35.38 + 77 =
  36. 36.338 + 68 =
  37. 37.123 + 27 =
  38. 38.151 + 88 =
  39. 39.258 + 39 =
  40. 40.200 + 37 =

Answer key

  1. 286
  2. 72
  3. 265
  4. 165
  5. 572
  6. 511
  7. 247
  8. 385
  9. 269
  10. 477
  11. 239
  12. 208
  13. 459
  14. 324
  15. 470
  16. 235
  17. 82
  18. 204
  19. 385
  20. 475
  21. 126
  22. 335
  23. 220
  24. 478
  25. 274
  26. 78
  27. 563
  28. 168
  29. 152
  30. 246
  31. 67
  32. 568
  33. 529
  34. 491
  35. 115
  36. 406
  37. 150
  38. 239
  39. 297
  40. 237

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