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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 29 · 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. 1.125 + 38 =
  2. 2.229 + 47 =
  3. 3.499 + 38 =
  4. 4.281 + 37 =
  5. 5.451 + 68 =
  6. 6.401 + 29 =
  7. 7.215 + 27 =
  8. 8.261 + 58 =
  9. 9.416 + 49 =
  10. 10.199 + 28 =
  11. 11.414 + 47 =
  12. 12.290 + 48 =
  13. 13.233 + 57 =
  14. 14.142 + 48 =
  15. 15.439 + 18 =
  16. 16.349 + 68 =
  17. 17.363 + 58 =
  18. 18.122 + 17 =
  19. 19.27 + 37 =
  20. 20.46 + 79 =
  21. 21.53 + 87 =
  22. 22.57 + 37 =
  23. 23.483 + 59 =
  24. 24.352 + 19 =
  25. 25.409 + 28 =
  26. 26.289 + 38 =
  27. 27.160 + 87 =
  28. 28.367 + 18 =
  29. 29.333 + 28 =
  30. 30.52 + 39 =
  31. 31.141 + 78 =
  32. 32.415 + 49 =
  33. 33.153 + 69 =
  34. 34.338 + 99 =
  35. 35.76 + 19 =
  36. 36.145 + 27 =
  37. 37.107 + 77 =
  38. 38.385 + 89 =
  39. 39.116 + 37 =
  40. 40.287 + 38 =

Answer key

  1. 163
  2. 276
  3. 537
  4. 318
  5. 519
  6. 430
  7. 242
  8. 319
  9. 465
  10. 227
  11. 461
  12. 338
  13. 290
  14. 190
  15. 457
  16. 417
  17. 421
  18. 139
  19. 64
  20. 125
  21. 140
  22. 94
  23. 542
  24. 371
  25. 437
  26. 327
  27. 247
  28. 385
  29. 361
  30. 91
  31. 219
  32. 464
  33. 222
  34. 437
  35. 95
  36. 172
  37. 184
  38. 474
  39. 153
  40. 325

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