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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 711 · 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. 1.123 + 39 =
  2. 2.477 + 47 =
  3. 3.190 + 47 =
  4. 4.208 + 37 =
  5. 5.37 + 27 =
  6. 6.320 + 49 =
  7. 7.341 + 59 =
  8. 8.143 + 29 =
  9. 9.219 + 48 =
  10. 10.236 + 68 =
  11. 11.27 + 39 =
  12. 12.473 + 39 =
  13. 13.472 + 19 =
  14. 14.266 + 29 =
  15. 15.298 + 39 =
  16. 16.476 + 28 =
  17. 17.389 + 27 =
  18. 18.159 + 17 =
  19. 19.432 + 17 =
  20. 20.226 + 97 =
  21. 21.28 + 89 =
  22. 22.251 + 87 =
  23. 23.361 + 37 =
  24. 24.453 + 88 =
  25. 25.84 + 27 =
  26. 26.342 + 57 =
  27. 27.73 + 47 =
  28. 28.181 + 79 =
  29. 29.27 + 37 =
  30. 30.480 + 37 =
  31. 31.449 + 27 =
  32. 32.341 + 99 =
  33. 33.460 + 68 =
  34. 34.464 + 49 =
  35. 35.406 + 57 =
  36. 36.275 + 79 =
  37. 37.459 + 67 =
  38. 38.327 + 38 =
  39. 39.456 + 78 =
  40. 40.178 + 48 =

Answer key

  1. 162
  2. 524
  3. 237
  4. 245
  5. 64
  6. 369
  7. 400
  8. 172
  9. 267
  10. 304
  11. 66
  12. 512
  13. 491
  14. 295
  15. 337
  16. 504
  17. 416
  18. 176
  19. 449
  20. 323
  21. 117
  22. 338
  23. 398
  24. 541
  25. 111
  26. 399
  27. 120
  28. 260
  29. 64
  30. 517
  31. 476
  32. 440
  33. 528
  34. 513
  35. 463
  36. 354
  37. 526
  38. 365
  39. 534
  40. 226

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