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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 133 · 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. 1.320 + 38 =
  2. 2.394 + 68 =
  3. 3.401 + 27 =
  4. 4.35 + 57 =
  5. 5.247 + 47 =
  6. 6.248 + 87 =
  7. 7.390 + 49 =
  8. 8.161 + 57 =
  9. 9.110 + 88 =
  10. 10.252 + 27 =
  11. 11.242 + 89 =
  12. 12.462 + 17 =
  13. 13.137 + 69 =
  14. 14.35 + 98 =
  15. 15.298 + 47 =
  16. 16.158 + 58 =
  17. 17.228 + 19 =
  18. 18.296 + 77 =
  19. 19.170 + 29 =
  20. 20.389 + 99 =
  21. 21.399 + 29 =
  22. 22.321 + 17 =
  23. 23.143 + 47 =
  24. 24.137 + 98 =
  25. 25.339 + 57 =
  26. 26.84 + 47 =
  27. 27.229 + 98 =
  28. 28.419 + 28 =
  29. 29.174 + 89 =
  30. 30.36 + 47 =
  31. 31.461 + 37 =
  32. 32.422 + 48 =
  33. 33.243 + 38 =
  34. 34.405 + 89 =
  35. 35.178 + 49 =
  36. 36.62 + 28 =
  37. 37.457 + 18 =
  38. 38.143 + 59 =
  39. 39.224 + 57 =
  40. 40.31 + 89 =

Answer key

  1. 358
  2. 462
  3. 428
  4. 92
  5. 294
  6. 335
  7. 439
  8. 218
  9. 198
  10. 279
  11. 331
  12. 479
  13. 206
  14. 133
  15. 345
  16. 216
  17. 247
  18. 373
  19. 199
  20. 488
  21. 428
  22. 338
  23. 190
  24. 235
  25. 396
  26. 131
  27. 327
  28. 447
  29. 263
  30. 83
  31. 498
  32. 470
  33. 281
  34. 494
  35. 227
  36. 90
  37. 475
  38. 202
  39. 281
  40. 120

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