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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 444 · 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. 1.313 + 48 =
  2. 2.424 + 18 =
  3. 3.317 + 18 =
  4. 4.123 + 57 =
  5. 5.33 + 39 =
  6. 6.407 + 49 =
  7. 7.32 + 38 =
  8. 8.142 + 38 =
  9. 9.233 + 59 =
  10. 10.78 + 59 =
  11. 11.270 + 98 =
  12. 12.253 + 48 =
  13. 13.110 + 49 =
  14. 14.493 + 78 =
  15. 15.72 + 58 =
  16. 16.425 + 58 =
  17. 17.427 + 18 =
  18. 18.441 + 39 =
  19. 19.383 + 39 =
  20. 20.122 + 67 =
  21. 21.419 + 77 =
  22. 22.238 + 28 =
  23. 23.48 + 38 =
  24. 24.82 + 59 =
  25. 25.340 + 18 =
  26. 26.175 + 99 =
  27. 27.60 + 37 =
  28. 28.356 + 29 =
  29. 29.164 + 27 =
  30. 30.100 + 67 =
  31. 31.217 + 39 =
  32. 32.483 + 77 =
  33. 33.155 + 77 =
  34. 34.128 + 58 =
  35. 35.321 + 87 =
  36. 36.216 + 98 =
  37. 37.349 + 89 =
  38. 38.96 + 29 =
  39. 39.435 + 18 =
  40. 40.273 + 88 =

Answer key

  1. 361
  2. 442
  3. 335
  4. 180
  5. 72
  6. 456
  7. 70
  8. 180
  9. 292
  10. 137
  11. 368
  12. 301
  13. 159
  14. 571
  15. 130
  16. 483
  17. 445
  18. 480
  19. 422
  20. 189
  21. 496
  22. 266
  23. 86
  24. 141
  25. 358
  26. 274
  27. 97
  28. 385
  29. 191
  30. 167
  31. 256
  32. 560
  33. 232
  34. 186
  35. 408
  36. 314
  37. 438
  38. 125
  39. 453
  40. 361

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