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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 409 · 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. 1.134 + 87 =
  2. 2.130 + 77 =
  3. 3.401 + 49 =
  4. 4.458 + 58 =
  5. 5.404 + 19 =
  6. 6.99 + 69 =
  7. 7.101 + 69 =
  8. 8.131 + 18 =
  9. 9.475 + 39 =
  10. 10.379 + 88 =
  11. 11.284 + 38 =
  12. 12.42 + 38 =
  13. 13.442 + 99 =
  14. 14.136 + 67 =
  15. 15.195 + 17 =
  16. 16.186 + 37 =
  17. 17.362 + 28 =
  18. 18.487 + 17 =
  19. 19.56 + 17 =
  20. 20.323 + 48 =
  21. 21.198 + 28 =
  22. 22.499 + 59 =
  23. 23.366 + 37 =
  24. 24.478 + 17 =
  25. 25.489 + 39 =
  26. 26.287 + 49 =
  27. 27.185 + 67 =
  28. 28.232 + 28 =
  29. 29.269 + 49 =
  30. 30.119 + 88 =
  31. 31.280 + 28 =
  32. 32.165 + 18 =
  33. 33.331 + 59 =
  34. 34.252 + 69 =
  35. 35.355 + 37 =
  36. 36.181 + 49 =
  37. 37.71 + 18 =
  38. 38.240 + 18 =
  39. 39.203 + 59 =
  40. 40.208 + 87 =

Answer key

  1. 221
  2. 207
  3. 450
  4. 516
  5. 423
  6. 168
  7. 170
  8. 149
  9. 514
  10. 467
  11. 322
  12. 80
  13. 541
  14. 203
  15. 212
  16. 223
  17. 390
  18. 504
  19. 73
  20. 371
  21. 226
  22. 558
  23. 403
  24. 495
  25. 528
  26. 336
  27. 252
  28. 260
  29. 318
  30. 207
  31. 308
  32. 183
  33. 390
  34. 321
  35. 392
  36. 230
  37. 89
  38. 258
  39. 262
  40. 295

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