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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 817 · 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. 1.494 + 29 =
  2. 2.98 + 37 =
  3. 3.201 + 69 =
  4. 4.74 + 17 =
  5. 5.158 + 77 =
  6. 6.161 + 99 =
  7. 7.122 + 67 =
  8. 8.427 + 19 =
  9. 9.193 + 59 =
  10. 10.231 + 68 =
  11. 11.367 + 57 =
  12. 12.122 + 27 =
  13. 13.344 + 97 =
  14. 14.321 + 98 =
  15. 15.129 + 69 =
  16. 16.422 + 49 =
  17. 17.393 + 19 =
  18. 18.480 + 19 =
  19. 19.323 + 39 =
  20. 20.369 + 58 =
  21. 21.61 + 78 =
  22. 22.287 + 67 =
  23. 23.271 + 57 =
  24. 24.268 + 27 =
  25. 25.366 + 17 =
  26. 26.137 + 88 =
  27. 27.118 + 67 =
  28. 28.262 + 47 =
  29. 29.35 + 77 =
  30. 30.301 + 68 =
  31. 31.169 + 59 =
  32. 32.203 + 57 =
  33. 33.125 + 48 =
  34. 34.384 + 79 =
  35. 35.350 + 48 =
  36. 36.193 + 39 =
  37. 37.187 + 98 =
  38. 38.496 + 27 =
  39. 39.223 + 19 =
  40. 40.396 + 97 =

Answer key

  1. 523
  2. 135
  3. 270
  4. 91
  5. 235
  6. 260
  7. 189
  8. 446
  9. 252
  10. 299
  11. 424
  12. 149
  13. 441
  14. 419
  15. 198
  16. 471
  17. 412
  18. 499
  19. 362
  20. 427
  21. 139
  22. 354
  23. 328
  24. 295
  25. 383
  26. 225
  27. 185
  28. 309
  29. 112
  30. 369
  31. 228
  32. 260
  33. 173
  34. 463
  35. 398
  36. 232
  37. 285
  38. 523
  39. 242
  40. 493

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