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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 631 · 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. 1.48 + 97 =
  2. 2.169 + 57 =
  3. 3.104 + 47 =
  4. 4.45 + 18 =
  5. 5.38 + 57 =
  6. 6.125 + 99 =
  7. 7.78 + 99 =
  8. 8.388 + 39 =
  9. 9.263 + 88 =
  10. 10.230 + 37 =
  11. 11.343 + 39 =
  12. 12.344 + 78 =
  13. 13.457 + 98 =
  14. 14.64 + 88 =
  15. 15.33 + 57 =
  16. 16.476 + 19 =
  17. 17.34 + 67 =
  18. 18.379 + 37 =
  19. 19.120 + 99 =
  20. 20.354 + 89 =
  21. 21.189 + 59 =
  22. 22.113 + 67 =
  23. 23.150 + 47 =
  24. 24.380 + 29 =
  25. 25.81 + 88 =
  26. 26.116 + 88 =
  27. 27.375 + 77 =
  28. 28.116 + 87 =
  29. 29.66 + 17 =
  30. 30.76 + 48 =
  31. 31.245 + 97 =
  32. 32.236 + 27 =
  33. 33.245 + 69 =
  34. 34.95 + 79 =
  35. 35.194 + 37 =
  36. 36.225 + 99 =
  37. 37.132 + 69 =
  38. 38.124 + 19 =
  39. 39.305 + 57 =
  40. 40.39 + 27 =

Answer key

  1. 145
  2. 226
  3. 151
  4. 63
  5. 95
  6. 224
  7. 177
  8. 427
  9. 351
  10. 267
  11. 382
  12. 422
  13. 555
  14. 152
  15. 90
  16. 495
  17. 101
  18. 416
  19. 219
  20. 443
  21. 248
  22. 180
  23. 197
  24. 409
  25. 169
  26. 204
  27. 452
  28. 203
  29. 83
  30. 124
  31. 342
  32. 263
  33. 314
  34. 174
  35. 231
  36. 324
  37. 201
  38. 143
  39. 362
  40. 66

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