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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 25 · 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. 1.173 + 67 =
  2. 2.253 + 19 =
  3. 3.178 + 79 =
  4. 4.423 + 57 =
  5. 5.330 + 98 =
  6. 6.422 + 87 =
  7. 7.471 + 48 =
  8. 8.132 + 19 =
  9. 9.195 + 38 =
  10. 10.323 + 19 =
  11. 11.105 + 89 =
  12. 12.255 + 17 =
  13. 13.130 + 89 =
  14. 14.379 + 58 =
  15. 15.374 + 68 =
  16. 16.369 + 88 =
  17. 17.389 + 98 =
  18. 18.59 + 68 =
  19. 19.327 + 57 =
  20. 20.69 + 68 =
  21. 21.150 + 49 =
  22. 22.152 + 78 =
  23. 23.120 + 58 =
  24. 24.291 + 68 =
  25. 25.103 + 27 =
  26. 26.89 + 27 =
  27. 27.139 + 48 =
  28. 28.72 + 67 =
  29. 29.266 + 97 =
  30. 30.242 + 99 =
  31. 31.241 + 87 =
  32. 32.303 + 47 =
  33. 33.27 + 58 =
  34. 34.92 + 38 =
  35. 35.48 + 59 =
  36. 36.321 + 17 =
  37. 37.241 + 47 =
  38. 38.160 + 37 =
  39. 39.493 + 67 =
  40. 40.81 + 39 =

Answer key

  1. 240
  2. 272
  3. 257
  4. 480
  5. 428
  6. 509
  7. 519
  8. 151
  9. 233
  10. 342
  11. 194
  12. 272
  13. 219
  14. 437
  15. 442
  16. 457
  17. 487
  18. 127
  19. 384
  20. 137
  21. 199
  22. 230
  23. 178
  24. 359
  25. 130
  26. 116
  27. 187
  28. 139
  29. 363
  30. 341
  31. 328
  32. 350
  33. 85
  34. 130
  35. 107
  36. 338
  37. 288
  38. 197
  39. 560
  40. 120

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