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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 643 · 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. 1.389 + 79 =
  2. 2.227 + 38 =
  3. 3.198 + 37 =
  4. 4.78 + 38 =
  5. 5.278 + 17 =
  6. 6.233 + 57 =
  7. 7.385 + 87 =
  8. 8.128 + 39 =
  9. 9.161 + 17 =
  10. 10.266 + 79 =
  11. 11.480 + 99 =
  12. 12.94 + 99 =
  13. 13.215 + 39 =
  14. 14.309 + 59 =
  15. 15.464 + 67 =
  16. 16.390 + 17 =
  17. 17.261 + 19 =
  18. 18.50 + 47 =
  19. 19.46 + 47 =
  20. 20.244 + 97 =
  21. 21.102 + 48 =
  22. 22.156 + 79 =
  23. 23.233 + 37 =
  24. 24.440 + 37 =
  25. 25.438 + 27 =
  26. 26.313 + 27 =
  27. 27.261 + 39 =
  28. 28.275 + 19 =
  29. 29.217 + 57 =
  30. 30.116 + 47 =
  31. 31.351 + 57 =
  32. 32.390 + 18 =
  33. 33.435 + 99 =
  34. 34.214 + 89 =
  35. 35.298 + 67 =
  36. 36.77 + 77 =
  37. 37.320 + 27 =
  38. 38.417 + 17 =
  39. 39.468 + 99 =
  40. 40.367 + 98 =

Answer key

  1. 468
  2. 265
  3. 235
  4. 116
  5. 295
  6. 290
  7. 472
  8. 167
  9. 178
  10. 345
  11. 579
  12. 193
  13. 254
  14. 368
  15. 531
  16. 407
  17. 280
  18. 97
  19. 93
  20. 341
  21. 150
  22. 235
  23. 270
  24. 477
  25. 465
  26. 340
  27. 300
  28. 294
  29. 274
  30. 163
  31. 408
  32. 408
  33. 534
  34. 303
  35. 365
  36. 154
  37. 347
  38. 434
  39. 567
  40. 465

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