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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 28 · 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. 1.344 + 78 =
  2. 2.95 + 19 =
  3. 3.106 + 47 =
  4. 4.125 + 67 =
  5. 5.461 + 78 =
  6. 6.495 + 49 =
  7. 7.316 + 19 =
  8. 8.464 + 29 =
  9. 9.228 + 79 =
  10. 10.408 + 39 =
  11. 11.127 + 69 =
  12. 12.48 + 27 =
  13. 13.410 + 57 =
  14. 14.95 + 38 =
  15. 15.74 + 68 =
  16. 16.74 + 39 =
  17. 17.304 + 37 =
  18. 18.212 + 89 =
  19. 19.389 + 27 =
  20. 20.381 + 98 =
  21. 21.351 + 38 =
  22. 22.451 + 67 =
  23. 23.258 + 29 =
  24. 24.308 + 48 =
  25. 25.208 + 29 =
  26. 26.466 + 48 =
  27. 27.152 + 49 =
  28. 28.28 + 99 =
  29. 29.424 + 18 =
  30. 30.388 + 28 =
  31. 31.167 + 48 =
  32. 32.32 + 57 =
  33. 33.45 + 18 =
  34. 34.145 + 49 =
  35. 35.68 + 89 =
  36. 36.407 + 57 =
  37. 37.452 + 19 =
  38. 38.278 + 27 =
  39. 39.359 + 98 =
  40. 40.51 + 27 =

Answer key

  1. 422
  2. 114
  3. 153
  4. 192
  5. 539
  6. 544
  7. 335
  8. 493
  9. 307
  10. 447
  11. 196
  12. 75
  13. 467
  14. 133
  15. 142
  16. 113
  17. 341
  18. 301
  19. 416
  20. 479
  21. 389
  22. 518
  23. 287
  24. 356
  25. 237
  26. 514
  27. 201
  28. 127
  29. 442
  30. 416
  31. 215
  32. 89
  33. 63
  34. 194
  35. 157
  36. 464
  37. 471
  38. 305
  39. 457
  40. 78

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