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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 205 · 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. 1.116 + 67 =
  2. 2.446 + 97 =
  3. 3.224 + 57 =
  4. 4.142 + 57 =
  5. 5.180 + 67 =
  6. 6.169 + 19 =
  7. 7.86 + 48 =
  8. 8.318 + 79 =
  9. 9.407 + 48 =
  10. 10.248 + 97 =
  11. 11.249 + 57 =
  12. 12.226 + 48 =
  13. 13.282 + 89 =
  14. 14.332 + 67 =
  15. 15.352 + 98 =
  16. 16.164 + 57 =
  17. 17.270 + 39 =
  18. 18.479 + 49 =
  19. 19.349 + 19 =
  20. 20.215 + 58 =
  21. 21.259 + 89 =
  22. 22.221 + 27 =
  23. 23.323 + 87 =
  24. 24.120 + 57 =
  25. 25.392 + 28 =
  26. 26.66 + 68 =
  27. 27.429 + 88 =
  28. 28.181 + 47 =
  29. 29.101 + 28 =
  30. 30.45 + 69 =
  31. 31.189 + 49 =
  32. 32.463 + 98 =
  33. 33.101 + 87 =
  34. 34.189 + 58 =
  35. 35.176 + 67 =
  36. 36.332 + 99 =
  37. 37.145 + 49 =
  38. 38.448 + 68 =
  39. 39.184 + 28 =
  40. 40.196 + 68 =

Answer key

  1. 183
  2. 543
  3. 281
  4. 199
  5. 247
  6. 188
  7. 134
  8. 397
  9. 455
  10. 345
  11. 306
  12. 274
  13. 371
  14. 399
  15. 450
  16. 221
  17. 309
  18. 528
  19. 368
  20. 273
  21. 348
  22. 248
  23. 410
  24. 177
  25. 420
  26. 134
  27. 517
  28. 228
  29. 129
  30. 114
  31. 238
  32. 561
  33. 188
  34. 247
  35. 243
  36. 431
  37. 194
  38. 516
  39. 212
  40. 264

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