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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 533 · 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. 1.409 + 79 =
  2. 2.207 + 37 =
  3. 3.401 + 89 =
  4. 4.268 + 97 =
  5. 5.37 + 47 =
  6. 6.284 + 17 =
  7. 7.285 + 88 =
  8. 8.144 + 87 =
  9. 9.462 + 19 =
  10. 10.129 + 67 =
  11. 11.459 + 88 =
  12. 12.310 + 57 =
  13. 13.148 + 57 =
  14. 14.144 + 98 =
  15. 15.308 + 68 =
  16. 16.67 + 18 =
  17. 17.144 + 28 =
  18. 18.358 + 79 =
  19. 19.396 + 98 =
  20. 20.360 + 48 =
  21. 21.288 + 88 =
  22. 22.210 + 88 =
  23. 23.428 + 38 =
  24. 24.61 + 39 =
  25. 25.156 + 87 =
  26. 26.46 + 88 =
  27. 27.173 + 97 =
  28. 28.238 + 77 =
  29. 29.200 + 97 =
  30. 30.33 + 89 =
  31. 31.473 + 29 =
  32. 32.452 + 17 =
  33. 33.25 + 59 =
  34. 34.426 + 99 =
  35. 35.243 + 59 =
  36. 36.268 + 69 =
  37. 37.155 + 47 =
  38. 38.81 + 29 =
  39. 39.92 + 49 =
  40. 40.251 + 68 =

Answer key

  1. 488
  2. 244
  3. 490
  4. 365
  5. 84
  6. 301
  7. 373
  8. 231
  9. 481
  10. 196
  11. 547
  12. 367
  13. 205
  14. 242
  15. 376
  16. 85
  17. 172
  18. 437
  19. 494
  20. 408
  21. 376
  22. 298
  23. 466
  24. 100
  25. 243
  26. 134
  27. 270
  28. 315
  29. 297
  30. 122
  31. 502
  32. 469
  33. 84
  34. 525
  35. 302
  36. 337
  37. 202
  38. 110
  39. 141
  40. 319

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