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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 660 · 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. 1.83 + 68 =
  2. 2.158 + 57 =
  3. 3.193 + 28 =
  4. 4.234 + 87 =
  5. 5.128 + 99 =
  6. 6.267 + 47 =
  7. 7.69 + 29 =
  8. 8.230 + 19 =
  9. 9.433 + 47 =
  10. 10.76 + 47 =
  11. 11.178 + 68 =
  12. 12.407 + 89 =
  13. 13.29 + 38 =
  14. 14.376 + 19 =
  15. 15.430 + 47 =
  16. 16.34 + 47 =
  17. 17.55 + 68 =
  18. 18.363 + 38 =
  19. 19.364 + 18 =
  20. 20.104 + 19 =
  21. 21.271 + 67 =
  22. 22.43 + 69 =
  23. 23.157 + 78 =
  24. 24.128 + 48 =
  25. 25.192 + 87 =
  26. 26.178 + 27 =
  27. 27.322 + 18 =
  28. 28.223 + 27 =
  29. 29.122 + 97 =
  30. 30.306 + 67 =
  31. 31.454 + 19 =
  32. 32.203 + 59 =
  33. 33.140 + 69 =
  34. 34.152 + 77 =
  35. 35.196 + 57 =
  36. 36.67 + 87 =
  37. 37.153 + 38 =
  38. 38.270 + 47 =
  39. 39.187 + 97 =
  40. 40.161 + 28 =

Answer key

  1. 151
  2. 215
  3. 221
  4. 321
  5. 227
  6. 314
  7. 98
  8. 249
  9. 480
  10. 123
  11. 246
  12. 496
  13. 67
  14. 395
  15. 477
  16. 81
  17. 123
  18. 401
  19. 382
  20. 123
  21. 338
  22. 112
  23. 235
  24. 176
  25. 279
  26. 205
  27. 340
  28. 250
  29. 219
  30. 373
  31. 473
  32. 262
  33. 209
  34. 229
  35. 253
  36. 154
  37. 191
  38. 317
  39. 284
  40. 189

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