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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 298 · 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. 1.181 + 77 =
  2. 2.235 + 87 =
  3. 3.235 + 67 =
  4. 4.243 + 77 =
  5. 5.323 + 27 =
  6. 6.337 + 87 =
  7. 7.496 + 57 =
  8. 8.462 + 88 =
  9. 9.341 + 17 =
  10. 10.262 + 99 =
  11. 11.362 + 88 =
  12. 12.227 + 47 =
  13. 13.421 + 77 =
  14. 14.75 + 79 =
  15. 15.61 + 87 =
  16. 16.389 + 18 =
  17. 17.250 + 99 =
  18. 18.328 + 99 =
  19. 19.451 + 69 =
  20. 20.310 + 87 =
  21. 21.32 + 68 =
  22. 22.123 + 87 =
  23. 23.156 + 97 =
  24. 24.341 + 37 =
  25. 25.430 + 39 =
  26. 26.422 + 48 =
  27. 27.406 + 19 =
  28. 28.348 + 29 =
  29. 29.461 + 88 =
  30. 30.176 + 19 =
  31. 31.98 + 18 =
  32. 32.383 + 37 =
  33. 33.213 + 48 =
  34. 34.380 + 58 =
  35. 35.468 + 99 =
  36. 36.291 + 97 =
  37. 37.85 + 67 =
  38. 38.51 + 89 =
  39. 39.291 + 58 =
  40. 40.161 + 58 =

Answer key

  1. 258
  2. 322
  3. 302
  4. 320
  5. 350
  6. 424
  7. 553
  8. 550
  9. 358
  10. 361
  11. 450
  12. 274
  13. 498
  14. 154
  15. 148
  16. 407
  17. 349
  18. 427
  19. 520
  20. 397
  21. 100
  22. 210
  23. 253
  24. 378
  25. 469
  26. 470
  27. 425
  28. 377
  29. 549
  30. 195
  31. 116
  32. 420
  33. 261
  34. 438
  35. 567
  36. 388
  37. 152
  38. 140
  39. 349
  40. 219

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