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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 37 · 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. 1.158 + 69 =
  2. 2.260 + 17 =
  3. 3.94 + 29 =
  4. 4.44 + 69 =
  5. 5.176 + 59 =
  6. 6.258 + 57 =
  7. 7.50 + 79 =
  8. 8.222 + 47 =
  9. 9.265 + 68 =
  10. 10.457 + 78 =
  11. 11.38 + 29 =
  12. 12.137 + 19 =
  13. 13.105 + 39 =
  14. 14.44 + 19 =
  15. 15.472 + 47 =
  16. 16.204 + 48 =
  17. 17.274 + 68 =
  18. 18.493 + 37 =
  19. 19.184 + 67 =
  20. 20.253 + 29 =
  21. 21.483 + 27 =
  22. 22.286 + 58 =
  23. 23.242 + 59 =
  24. 24.153 + 28 =
  25. 25.102 + 57 =
  26. 26.235 + 47 =
  27. 27.459 + 19 =
  28. 28.481 + 99 =
  29. 29.381 + 59 =
  30. 30.112 + 29 =
  31. 31.431 + 37 =
  32. 32.104 + 68 =
  33. 33.348 + 57 =
  34. 34.208 + 38 =
  35. 35.432 + 77 =
  36. 36.46 + 27 =
  37. 37.161 + 97 =
  38. 38.308 + 39 =
  39. 39.134 + 48 =
  40. 40.490 + 67 =

Answer key

  1. 227
  2. 277
  3. 123
  4. 113
  5. 235
  6. 315
  7. 129
  8. 269
  9. 333
  10. 535
  11. 67
  12. 156
  13. 144
  14. 63
  15. 519
  16. 252
  17. 342
  18. 530
  19. 251
  20. 282
  21. 510
  22. 344
  23. 301
  24. 181
  25. 159
  26. 282
  27. 478
  28. 580
  29. 440
  30. 141
  31. 468
  32. 172
  33. 405
  34. 246
  35. 509
  36. 73
  37. 258
  38. 347
  39. 182
  40. 557

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