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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 669 · 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. 1.40 + 68 =
  2. 2.176 + 48 =
  3. 3.349 + 39 =
  4. 4.367 + 87 =
  5. 5.474 + 88 =
  6. 6.50 + 67 =
  7. 7.310 + 97 =
  8. 8.176 + 37 =
  9. 9.53 + 99 =
  10. 10.76 + 99 =
  11. 11.413 + 57 =
  12. 12.165 + 67 =
  13. 13.443 + 39 =
  14. 14.183 + 67 =
  15. 15.337 + 69 =
  16. 16.375 + 49 =
  17. 17.139 + 27 =
  18. 18.403 + 68 =
  19. 19.312 + 59 =
  20. 20.349 + 78 =
  21. 21.392 + 99 =
  22. 22.468 + 67 =
  23. 23.494 + 17 =
  24. 24.238 + 48 =
  25. 25.458 + 19 =
  26. 26.92 + 99 =
  27. 27.195 + 27 =
  28. 28.32 + 99 =
  29. 29.50 + 89 =
  30. 30.227 + 77 =
  31. 31.89 + 98 =
  32. 32.483 + 27 =
  33. 33.92 + 19 =
  34. 34.153 + 17 =
  35. 35.297 + 38 =
  36. 36.286 + 17 =
  37. 37.244 + 57 =
  38. 38.266 + 17 =
  39. 39.300 + 58 =
  40. 40.245 + 87 =

Answer key

  1. 108
  2. 224
  3. 388
  4. 454
  5. 562
  6. 117
  7. 407
  8. 213
  9. 152
  10. 175
  11. 470
  12. 232
  13. 482
  14. 250
  15. 406
  16. 424
  17. 166
  18. 471
  19. 371
  20. 427
  21. 491
  22. 535
  23. 511
  24. 286
  25. 477
  26. 191
  27. 222
  28. 131
  29. 139
  30. 304
  31. 187
  32. 510
  33. 111
  34. 170
  35. 335
  36. 303
  37. 301
  38. 283
  39. 358
  40. 332

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