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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 234 · 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. 1.361 + 89 =
  2. 2.322 + 67 =
  3. 3.169 + 98 =
  4. 4.34 + 78 =
  5. 5.421 + 79 =
  6. 6.337 + 49 =
  7. 7.303 + 88 =
  8. 8.237 + 29 =
  9. 9.112 + 47 =
  10. 10.284 + 97 =
  11. 11.139 + 48 =
  12. 12.439 + 29 =
  13. 13.228 + 38 =
  14. 14.363 + 29 =
  15. 15.170 + 37 =
  16. 16.89 + 89 =
  17. 17.77 + 48 =
  18. 18.151 + 47 =
  19. 19.419 + 87 =
  20. 20.101 + 19 =
  21. 21.66 + 99 =
  22. 22.111 + 38 =
  23. 23.59 + 37 =
  24. 24.101 + 68 =
  25. 25.251 + 88 =
  26. 26.68 + 47 =
  27. 27.150 + 17 =
  28. 28.465 + 47 =
  29. 29.180 + 18 =
  30. 30.94 + 77 =
  31. 31.95 + 37 =
  32. 32.121 + 19 =
  33. 33.285 + 29 =
  34. 34.98 + 19 =
  35. 35.261 + 27 =
  36. 36.192 + 27 =
  37. 37.497 + 18 =
  38. 38.225 + 19 =
  39. 39.477 + 58 =
  40. 40.259 + 59 =

Answer key

  1. 450
  2. 389
  3. 267
  4. 112
  5. 500
  6. 386
  7. 391
  8. 266
  9. 159
  10. 381
  11. 187
  12. 468
  13. 266
  14. 392
  15. 207
  16. 178
  17. 125
  18. 198
  19. 506
  20. 120
  21. 165
  22. 149
  23. 96
  24. 169
  25. 339
  26. 115
  27. 167
  28. 512
  29. 198
  30. 171
  31. 132
  32. 140
  33. 314
  34. 117
  35. 288
  36. 219
  37. 515
  38. 244
  39. 535
  40. 318

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