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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 796 · 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. 1.68 + 67 =
  2. 2.376 + 29 =
  3. 3.409 + 79 =
  4. 4.378 + 27 =
  5. 5.153 + 57 =
  6. 6.349 + 78 =
  7. 7.331 + 87 =
  8. 8.333 + 79 =
  9. 9.54 + 38 =
  10. 10.420 + 47 =
  11. 11.85 + 88 =
  12. 12.63 + 27 =
  13. 13.489 + 78 =
  14. 14.236 + 77 =
  15. 15.57 + 67 =
  16. 16.48 + 59 =
  17. 17.156 + 27 =
  18. 18.126 + 39 =
  19. 19.313 + 88 =
  20. 20.419 + 67 =
  21. 21.144 + 89 =
  22. 22.209 + 79 =
  23. 23.300 + 99 =
  24. 24.497 + 19 =
  25. 25.143 + 57 =
  26. 26.170 + 37 =
  27. 27.263 + 68 =
  28. 28.39 + 27 =
  29. 29.186 + 38 =
  30. 30.138 + 37 =
  31. 31.272 + 47 =
  32. 32.90 + 79 =
  33. 33.348 + 17 =
  34. 34.429 + 57 =
  35. 35.333 + 49 =
  36. 36.119 + 27 =
  37. 37.353 + 57 =
  38. 38.164 + 39 =
  39. 39.310 + 49 =
  40. 40.474 + 17 =

Answer key

  1. 135
  2. 405
  3. 488
  4. 405
  5. 210
  6. 427
  7. 418
  8. 412
  9. 92
  10. 467
  11. 173
  12. 90
  13. 567
  14. 313
  15. 124
  16. 107
  17. 183
  18. 165
  19. 401
  20. 486
  21. 233
  22. 288
  23. 399
  24. 516
  25. 200
  26. 207
  27. 331
  28. 66
  29. 224
  30. 175
  31. 319
  32. 169
  33. 365
  34. 486
  35. 382
  36. 146
  37. 410
  38. 203
  39. 359
  40. 491

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