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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 157 · 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. 1.121 + 47 =
  2. 2.128 + 19 =
  3. 3.462 + 87 =
  4. 4.156 + 47 =
  5. 5.200 + 27 =
  6. 6.445 + 88 =
  7. 7.399 + 38 =
  8. 8.128 + 89 =
  9. 9.383 + 28 =
  10. 10.206 + 98 =
  11. 11.193 + 37 =
  12. 12.199 + 57 =
  13. 13.51 + 99 =
  14. 14.426 + 97 =
  15. 15.456 + 48 =
  16. 16.410 + 38 =
  17. 17.206 + 28 =
  18. 18.165 + 99 =
  19. 19.262 + 68 =
  20. 20.185 + 77 =
  21. 21.81 + 17 =
  22. 22.217 + 58 =
  23. 23.85 + 98 =
  24. 24.498 + 68 =
  25. 25.466 + 29 =
  26. 26.171 + 39 =
  27. 27.360 + 68 =
  28. 28.37 + 37 =
  29. 29.107 + 78 =
  30. 30.210 + 97 =
  31. 31.403 + 67 =
  32. 32.28 + 47 =
  33. 33.283 + 57 =
  34. 34.410 + 47 =
  35. 35.345 + 87 =
  36. 36.230 + 87 =
  37. 37.421 + 39 =
  38. 38.90 + 99 =
  39. 39.244 + 39 =
  40. 40.407 + 77 =

Answer key

  1. 168
  2. 147
  3. 549
  4. 203
  5. 227
  6. 533
  7. 437
  8. 217
  9. 411
  10. 304
  11. 230
  12. 256
  13. 150
  14. 523
  15. 504
  16. 448
  17. 234
  18. 264
  19. 330
  20. 262
  21. 98
  22. 275
  23. 183
  24. 566
  25. 495
  26. 210
  27. 428
  28. 74
  29. 185
  30. 307
  31. 470
  32. 75
  33. 340
  34. 457
  35. 432
  36. 317
  37. 460
  38. 189
  39. 283
  40. 484

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