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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 508 · 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. 1.388 + 58 =
  2. 2.88 + 39 =
  3. 3.50 + 47 =
  4. 4.446 + 57 =
  5. 5.193 + 89 =
  6. 6.248 + 99 =
  7. 7.366 + 69 =
  8. 8.295 + 59 =
  9. 9.425 + 39 =
  10. 10.136 + 47 =
  11. 11.396 + 58 =
  12. 12.219 + 18 =
  13. 13.186 + 49 =
  14. 14.367 + 17 =
  15. 15.198 + 37 =
  16. 16.81 + 58 =
  17. 17.226 + 69 =
  18. 18.347 + 59 =
  19. 19.92 + 88 =
  20. 20.42 + 39 =
  21. 21.156 + 99 =
  22. 22.410 + 69 =
  23. 23.151 + 37 =
  24. 24.447 + 48 =
  25. 25.374 + 88 =
  26. 26.142 + 77 =
  27. 27.67 + 18 =
  28. 28.480 + 77 =
  29. 29.237 + 78 =
  30. 30.55 + 69 =
  31. 31.110 + 88 =
  32. 32.176 + 27 =
  33. 33.367 + 79 =
  34. 34.109 + 97 =
  35. 35.401 + 28 =
  36. 36.155 + 79 =
  37. 37.109 + 98 =
  38. 38.458 + 49 =
  39. 39.400 + 29 =
  40. 40.185 + 67 =

Answer key

  1. 446
  2. 127
  3. 97
  4. 503
  5. 282
  6. 347
  7. 435
  8. 354
  9. 464
  10. 183
  11. 454
  12. 237
  13. 235
  14. 384
  15. 235
  16. 139
  17. 295
  18. 406
  19. 180
  20. 81
  21. 255
  22. 479
  23. 188
  24. 495
  25. 462
  26. 219
  27. 85
  28. 557
  29. 315
  30. 124
  31. 198
  32. 203
  33. 446
  34. 206
  35. 429
  36. 234
  37. 207
  38. 507
  39. 429
  40. 252

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