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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 621 · 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. 1.364 + 79 =
  2. 2.200 + 77 =
  3. 3.37 + 48 =
  4. 4.440 + 39 =
  5. 5.117 + 28 =
  6. 6.132 + 39 =
  7. 7.462 + 17 =
  8. 8.424 + 38 =
  9. 9.62 + 47 =
  10. 10.144 + 69 =
  11. 11.206 + 59 =
  12. 12.349 + 17 =
  13. 13.173 + 48 =
  14. 14.77 + 79 =
  15. 15.237 + 17 =
  16. 16.284 + 78 =
  17. 17.143 + 79 =
  18. 18.394 + 39 =
  19. 19.310 + 78 =
  20. 20.107 + 37 =
  21. 21.187 + 37 =
  22. 22.247 + 87 =
  23. 23.347 + 57 =
  24. 24.454 + 47 =
  25. 25.250 + 99 =
  26. 26.215 + 28 =
  27. 27.341 + 47 =
  28. 28.84 + 87 =
  29. 29.167 + 27 =
  30. 30.50 + 89 =
  31. 31.384 + 28 =
  32. 32.253 + 68 =
  33. 33.88 + 77 =
  34. 34.237 + 19 =
  35. 35.410 + 19 =
  36. 36.318 + 19 =
  37. 37.93 + 87 =
  38. 38.494 + 77 =
  39. 39.317 + 17 =
  40. 40.494 + 29 =

Answer key

  1. 443
  2. 277
  3. 85
  4. 479
  5. 145
  6. 171
  7. 479
  8. 462
  9. 109
  10. 213
  11. 265
  12. 366
  13. 221
  14. 156
  15. 254
  16. 362
  17. 222
  18. 433
  19. 388
  20. 144
  21. 224
  22. 334
  23. 404
  24. 501
  25. 349
  26. 243
  27. 388
  28. 171
  29. 194
  30. 139
  31. 412
  32. 321
  33. 165
  34. 256
  35. 429
  36. 337
  37. 180
  38. 571
  39. 334
  40. 523

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