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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 419 · 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. 1.199 + 98 =
  2. 2.241 + 47 =
  3. 3.498 + 78 =
  4. 4.159 + 87 =
  5. 5.213 + 28 =
  6. 6.76 + 98 =
  7. 7.143 + 89 =
  8. 8.63 + 68 =
  9. 9.132 + 89 =
  10. 10.465 + 79 =
  11. 11.77 + 37 =
  12. 12.311 + 37 =
  13. 13.174 + 49 =
  14. 14.84 + 98 =
  15. 15.414 + 39 =
  16. 16.498 + 48 =
  17. 17.43 + 79 =
  18. 18.270 + 48 =
  19. 19.329 + 49 =
  20. 20.333 + 57 =
  21. 21.379 + 29 =
  22. 22.164 + 37 =
  23. 23.424 + 99 =
  24. 24.433 + 28 =
  25. 25.407 + 37 =
  26. 26.334 + 87 =
  27. 27.357 + 69 =
  28. 28.113 + 17 =
  29. 29.457 + 77 =
  30. 30.110 + 97 =
  31. 31.53 + 49 =
  32. 32.356 + 28 =
  33. 33.301 + 28 =
  34. 34.79 + 29 =
  35. 35.32 + 88 =
  36. 36.141 + 89 =
  37. 37.180 + 67 =
  38. 38.323 + 29 =
  39. 39.244 + 78 =
  40. 40.215 + 57 =

Answer key

  1. 297
  2. 288
  3. 576
  4. 246
  5. 241
  6. 174
  7. 232
  8. 131
  9. 221
  10. 544
  11. 114
  12. 348
  13. 223
  14. 182
  15. 453
  16. 546
  17. 122
  18. 318
  19. 378
  20. 390
  21. 408
  22. 201
  23. 523
  24. 461
  25. 444
  26. 421
  27. 426
  28. 130
  29. 534
  30. 207
  31. 102
  32. 384
  33. 329
  34. 108
  35. 120
  36. 230
  37. 247
  38. 352
  39. 322
  40. 272

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