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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 686 · 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. 1.492 + 87 =
  2. 2.356 + 39 =
  3. 3.313 + 89 =
  4. 4.93 + 97 =
  5. 5.67 + 87 =
  6. 6.178 + 38 =
  7. 7.197 + 68 =
  8. 8.246 + 48 =
  9. 9.165 + 88 =
  10. 10.76 + 57 =
  11. 11.246 + 89 =
  12. 12.428 + 39 =
  13. 13.434 + 57 =
  14. 14.62 + 39 =
  15. 15.489 + 89 =
  16. 16.233 + 87 =
  17. 17.134 + 57 =
  18. 18.145 + 99 =
  19. 19.212 + 18 =
  20. 20.395 + 48 =
  21. 21.473 + 89 =
  22. 22.71 + 29 =
  23. 23.303 + 98 =
  24. 24.405 + 18 =
  25. 25.382 + 27 =
  26. 26.397 + 18 =
  27. 27.417 + 97 =
  28. 28.76 + 27 =
  29. 29.360 + 27 =
  30. 30.189 + 77 =
  31. 31.196 + 27 =
  32. 32.402 + 29 =
  33. 33.213 + 68 =
  34. 34.496 + 99 =
  35. 35.405 + 98 =
  36. 36.88 + 68 =
  37. 37.348 + 77 =
  38. 38.126 + 58 =
  39. 39.301 + 29 =
  40. 40.279 + 59 =

Answer key

  1. 579
  2. 395
  3. 402
  4. 190
  5. 154
  6. 216
  7. 265
  8. 294
  9. 253
  10. 133
  11. 335
  12. 467
  13. 491
  14. 101
  15. 578
  16. 320
  17. 191
  18. 244
  19. 230
  20. 443
  21. 562
  22. 100
  23. 401
  24. 423
  25. 409
  26. 415
  27. 514
  28. 103
  29. 387
  30. 266
  31. 223
  32. 431
  33. 281
  34. 595
  35. 503
  36. 156
  37. 425
  38. 184
  39. 330
  40. 338

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