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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 285 · 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. 1.257 + 48 =
  2. 2.340 + 19 =
  3. 3.277 + 47 =
  4. 4.48 + 59 =
  5. 5.173 + 19 =
  6. 6.443 + 48 =
  7. 7.340 + 27 =
  8. 8.153 + 49 =
  9. 9.77 + 98 =
  10. 10.205 + 58 =
  11. 11.247 + 88 =
  12. 12.97 + 27 =
  13. 13.200 + 37 =
  14. 14.276 + 48 =
  15. 15.132 + 57 =
  16. 16.147 + 69 =
  17. 17.134 + 18 =
  18. 18.222 + 49 =
  19. 19.101 + 67 =
  20. 20.358 + 17 =
  21. 21.327 + 38 =
  22. 22.395 + 37 =
  23. 23.281 + 59 =
  24. 24.396 + 58 =
  25. 25.206 + 17 =
  26. 26.258 + 27 =
  27. 27.175 + 87 =
  28. 28.46 + 97 =
  29. 29.217 + 27 =
  30. 30.41 + 69 =
  31. 31.78 + 79 =
  32. 32.314 + 28 =
  33. 33.177 + 29 =
  34. 34.234 + 59 =
  35. 35.236 + 89 =
  36. 36.282 + 89 =
  37. 37.428 + 89 =
  38. 38.155 + 37 =
  39. 39.477 + 28 =
  40. 40.256 + 69 =

Answer key

  1. 305
  2. 359
  3. 324
  4. 107
  5. 192
  6. 491
  7. 367
  8. 202
  9. 175
  10. 263
  11. 335
  12. 124
  13. 237
  14. 324
  15. 189
  16. 216
  17. 152
  18. 271
  19. 168
  20. 375
  21. 365
  22. 432
  23. 340
  24. 454
  25. 223
  26. 285
  27. 262
  28. 143
  29. 244
  30. 110
  31. 157
  32. 342
  33. 206
  34. 293
  35. 325
  36. 371
  37. 517
  38. 192
  39. 505
  40. 325

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