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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 768 · 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. 1.347 + 88 =
  2. 2.213 + 99 =
  3. 3.425 + 19 =
  4. 4.243 + 17 =
  5. 5.242 + 27 =
  6. 6.116 + 69 =
  7. 7.319 + 98 =
  8. 8.79 + 69 =
  9. 9.284 + 89 =
  10. 10.42 + 78 =
  11. 11.129 + 57 =
  12. 12.162 + 18 =
  13. 13.403 + 38 =
  14. 14.262 + 19 =
  15. 15.432 + 47 =
  16. 16.489 + 18 =
  17. 17.465 + 19 =
  18. 18.124 + 27 =
  19. 19.496 + 57 =
  20. 20.131 + 49 =
  21. 21.428 + 88 =
  22. 22.189 + 49 =
  23. 23.92 + 17 =
  24. 24.65 + 18 =
  25. 25.425 + 48 =
  26. 26.426 + 67 =
  27. 27.396 + 69 =
  28. 28.27 + 28 =
  29. 29.184 + 57 =
  30. 30.236 + 19 =
  31. 31.236 + 39 =
  32. 32.384 + 57 =
  33. 33.228 + 99 =
  34. 34.347 + 48 =
  35. 35.128 + 57 =
  36. 36.153 + 39 =
  37. 37.330 + 39 =
  38. 38.218 + 59 =
  39. 39.372 + 38 =
  40. 40.347 + 48 =

Answer key

  1. 435
  2. 312
  3. 444
  4. 260
  5. 269
  6. 185
  7. 417
  8. 148
  9. 373
  10. 120
  11. 186
  12. 180
  13. 441
  14. 281
  15. 479
  16. 507
  17. 484
  18. 151
  19. 553
  20. 180
  21. 516
  22. 238
  23. 109
  24. 83
  25. 473
  26. 493
  27. 465
  28. 55
  29. 241
  30. 255
  31. 275
  32. 441
  33. 327
  34. 395
  35. 185
  36. 192
  37. 369
  38. 277
  39. 410
  40. 395

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