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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 774 · 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. 1.247 + 19 =
  2. 2.362 + 88 =
  3. 3.253 + 79 =
  4. 4.449 + 59 =
  5. 5.169 + 58 =
  6. 6.335 + 48 =
  7. 7.50 + 18 =
  8. 8.208 + 39 =
  9. 9.88 + 57 =
  10. 10.378 + 67 =
  11. 11.230 + 18 =
  12. 12.330 + 48 =
  13. 13.281 + 57 =
  14. 14.96 + 89 =
  15. 15.41 + 88 =
  16. 16.448 + 48 =
  17. 17.57 + 17 =
  18. 18.379 + 97 =
  19. 19.196 + 99 =
  20. 20.380 + 77 =
  21. 21.154 + 47 =
  22. 22.345 + 88 =
  23. 23.52 + 67 =
  24. 24.82 + 37 =
  25. 25.136 + 48 =
  26. 26.288 + 27 =
  27. 27.343 + 97 =
  28. 28.426 + 77 =
  29. 29.158 + 48 =
  30. 30.398 + 47 =
  31. 31.392 + 78 =
  32. 32.472 + 29 =
  33. 33.103 + 37 =
  34. 34.203 + 48 =
  35. 35.208 + 19 =
  36. 36.238 + 88 =
  37. 37.386 + 37 =
  38. 38.87 + 58 =
  39. 39.83 + 48 =
  40. 40.32 + 87 =

Answer key

  1. 266
  2. 450
  3. 332
  4. 508
  5. 227
  6. 383
  7. 68
  8. 247
  9. 145
  10. 445
  11. 248
  12. 378
  13. 338
  14. 185
  15. 129
  16. 496
  17. 74
  18. 476
  19. 295
  20. 457
  21. 201
  22. 433
  23. 119
  24. 119
  25. 184
  26. 315
  27. 440
  28. 503
  29. 206
  30. 445
  31. 470
  32. 501
  33. 140
  34. 251
  35. 227
  36. 326
  37. 423
  38. 145
  39. 131
  40. 119

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