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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 153 · 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. 1.404 + 78 =
  2. 2.427 + 69 =
  3. 3.33 + 88 =
  4. 4.116 + 67 =
  5. 5.159 + 69 =
  6. 6.182 + 27 =
  7. 7.320 + 17 =
  8. 8.461 + 97 =
  9. 9.112 + 57 =
  10. 10.263 + 19 =
  11. 11.114 + 69 =
  12. 12.423 + 47 =
  13. 13.372 + 99 =
  14. 14.290 + 97 =
  15. 15.467 + 19 =
  16. 16.262 + 68 =
  17. 17.220 + 27 =
  18. 18.145 + 97 =
  19. 19.318 + 18 =
  20. 20.149 + 27 =
  21. 21.410 + 19 =
  22. 22.391 + 77 =
  23. 23.332 + 47 =
  24. 24.165 + 27 =
  25. 25.41 + 67 =
  26. 26.71 + 29 =
  27. 27.230 + 47 =
  28. 28.287 + 18 =
  29. 29.188 + 69 =
  30. 30.350 + 58 =
  31. 31.397 + 59 =
  32. 32.110 + 98 =
  33. 33.143 + 77 =
  34. 34.115 + 47 =
  35. 35.177 + 38 =
  36. 36.348 + 39 =
  37. 37.355 + 57 =
  38. 38.49 + 79 =
  39. 39.40 + 89 =
  40. 40.99 + 98 =

Answer key

  1. 482
  2. 496
  3. 121
  4. 183
  5. 228
  6. 209
  7. 337
  8. 558
  9. 169
  10. 282
  11. 183
  12. 470
  13. 471
  14. 387
  15. 486
  16. 330
  17. 247
  18. 242
  19. 336
  20. 176
  21. 429
  22. 468
  23. 379
  24. 192
  25. 108
  26. 100
  27. 277
  28. 305
  29. 257
  30. 408
  31. 456
  32. 208
  33. 220
  34. 162
  35. 215
  36. 387
  37. 412
  38. 128
  39. 129
  40. 197

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