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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 308 · 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. 1.187 + 97 =
  2. 2.290 + 29 =
  3. 3.245 + 29 =
  4. 4.208 + 87 =
  5. 5.83 + 58 =
  6. 6.339 + 88 =
  7. 7.194 + 99 =
  8. 8.79 + 37 =
  9. 9.207 + 27 =
  10. 10.87 + 49 =
  11. 11.254 + 87 =
  12. 12.430 + 77 =
  13. 13.205 + 67 =
  14. 14.164 + 57 =
  15. 15.468 + 67 =
  16. 16.267 + 57 =
  17. 17.447 + 67 =
  18. 18.460 + 49 =
  19. 19.376 + 78 =
  20. 20.198 + 78 =
  21. 21.303 + 69 =
  22. 22.62 + 58 =
  23. 23.291 + 49 =
  24. 24.150 + 58 =
  25. 25.239 + 47 =
  26. 26.324 + 77 =
  27. 27.76 + 37 =
  28. 28.343 + 79 =
  29. 29.98 + 29 =
  30. 30.96 + 49 =
  31. 31.229 + 89 =
  32. 32.238 + 67 =
  33. 33.50 + 38 =
  34. 34.112 + 47 =
  35. 35.143 + 19 =
  36. 36.26 + 48 =
  37. 37.208 + 37 =
  38. 38.426 + 47 =
  39. 39.83 + 69 =
  40. 40.78 + 57 =

Answer key

  1. 284
  2. 319
  3. 274
  4. 295
  5. 141
  6. 427
  7. 293
  8. 116
  9. 234
  10. 136
  11. 341
  12. 507
  13. 272
  14. 221
  15. 535
  16. 324
  17. 514
  18. 509
  19. 454
  20. 276
  21. 372
  22. 120
  23. 340
  24. 208
  25. 286
  26. 401
  27. 113
  28. 422
  29. 127
  30. 145
  31. 318
  32. 305
  33. 88
  34. 159
  35. 162
  36. 74
  37. 245
  38. 473
  39. 152
  40. 135

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