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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 192 · 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. 1.129 + 17 =
  2. 2.266 + 77 =
  3. 3.197 + 97 =
  4. 4.262 + 67 =
  5. 5.215 + 88 =
  6. 6.124 + 57 =
  7. 7.143 + 57 =
  8. 8.270 + 59 =
  9. 9.215 + 18 =
  10. 10.246 + 77 =
  11. 11.56 + 99 =
  12. 12.67 + 99 =
  13. 13.76 + 39 =
  14. 14.56 + 19 =
  15. 15.283 + 88 =
  16. 16.405 + 47 =
  17. 17.81 + 79 =
  18. 18.449 + 47 =
  19. 19.367 + 69 =
  20. 20.450 + 39 =
  21. 21.256 + 17 =
  22. 22.291 + 69 =
  23. 23.408 + 59 =
  24. 24.443 + 39 =
  25. 25.297 + 47 =
  26. 26.170 + 88 =
  27. 27.124 + 37 =
  28. 28.291 + 29 =
  29. 29.116 + 27 =
  30. 30.155 + 77 =
  31. 31.106 + 98 =
  32. 32.111 + 59 =
  33. 33.129 + 97 =
  34. 34.417 + 57 =
  35. 35.109 + 38 =
  36. 36.242 + 37 =
  37. 37.266 + 68 =
  38. 38.288 + 39 =
  39. 39.216 + 17 =
  40. 40.112 + 98 =

Answer key

  1. 146
  2. 343
  3. 294
  4. 329
  5. 303
  6. 181
  7. 200
  8. 329
  9. 233
  10. 323
  11. 155
  12. 166
  13. 115
  14. 75
  15. 371
  16. 452
  17. 160
  18. 496
  19. 436
  20. 489
  21. 273
  22. 360
  23. 467
  24. 482
  25. 344
  26. 258
  27. 161
  28. 320
  29. 143
  30. 232
  31. 204
  32. 170
  33. 226
  34. 474
  35. 147
  36. 279
  37. 334
  38. 327
  39. 233
  40. 210

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