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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 463 · 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. 1.236 + 28 =
  2. 2.319 + 99 =
  3. 3.439 + 59 =
  4. 4.430 + 19 =
  5. 5.131 + 19 =
  6. 6.133 + 97 =
  7. 7.89 + 99 =
  8. 8.199 + 17 =
  9. 9.434 + 17 =
  10. 10.183 + 78 =
  11. 11.246 + 78 =
  12. 12.43 + 58 =
  13. 13.121 + 77 =
  14. 14.238 + 57 =
  15. 15.376 + 57 =
  16. 16.419 + 87 =
  17. 17.380 + 18 =
  18. 18.348 + 89 =
  19. 19.339 + 77 =
  20. 20.148 + 17 =
  21. 21.155 + 37 =
  22. 22.353 + 98 =
  23. 23.233 + 18 =
  24. 24.398 + 78 =
  25. 25.469 + 19 =
  26. 26.456 + 79 =
  27. 27.365 + 57 =
  28. 28.71 + 57 =
  29. 29.175 + 48 =
  30. 30.169 + 68 =
  31. 31.281 + 87 =
  32. 32.234 + 37 =
  33. 33.175 + 18 =
  34. 34.271 + 87 =
  35. 35.323 + 18 =
  36. 36.408 + 59 =
  37. 37.306 + 69 =
  38. 38.481 + 49 =
  39. 39.254 + 79 =
  40. 40.262 + 79 =

Answer key

  1. 264
  2. 418
  3. 498
  4. 449
  5. 150
  6. 230
  7. 188
  8. 216
  9. 451
  10. 261
  11. 324
  12. 101
  13. 198
  14. 295
  15. 433
  16. 506
  17. 398
  18. 437
  19. 416
  20. 165
  21. 192
  22. 451
  23. 251
  24. 476
  25. 488
  26. 535
  27. 422
  28. 128
  29. 223
  30. 237
  31. 368
  32. 271
  33. 193
  34. 358
  35. 341
  36. 467
  37. 375
  38. 530
  39. 333
  40. 341

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