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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 30 · 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. 1.465 + 79 =
  2. 2.26 + 98 =
  3. 3.131 + 37 =
  4. 4.422 + 19 =
  5. 5.324 + 89 =
  6. 6.184 + 68 =
  7. 7.48 + 39 =
  8. 8.243 + 39 =
  9. 9.360 + 88 =
  10. 10.127 + 68 =
  11. 11.143 + 87 =
  12. 12.430 + 29 =
  13. 13.450 + 97 =
  14. 14.493 + 37 =
  15. 15.457 + 18 =
  16. 16.164 + 79 =
  17. 17.107 + 28 =
  18. 18.343 + 29 =
  19. 19.141 + 37 =
  20. 20.260 + 37 =
  21. 21.53 + 99 =
  22. 22.480 + 19 =
  23. 23.217 + 49 =
  24. 24.486 + 69 =
  25. 25.457 + 28 =
  26. 26.249 + 19 =
  27. 27.373 + 38 =
  28. 28.193 + 48 =
  29. 29.80 + 89 =
  30. 30.54 + 27 =
  31. 31.244 + 18 =
  32. 32.203 + 67 =
  33. 33.183 + 58 =
  34. 34.346 + 58 =
  35. 35.333 + 18 =
  36. 36.381 + 27 =
  37. 37.162 + 38 =
  38. 38.112 + 68 =
  39. 39.28 + 49 =
  40. 40.312 + 18 =

Answer key

  1. 544
  2. 124
  3. 168
  4. 441
  5. 413
  6. 252
  7. 87
  8. 282
  9. 448
  10. 195
  11. 230
  12. 459
  13. 547
  14. 530
  15. 475
  16. 243
  17. 135
  18. 372
  19. 178
  20. 297
  21. 152
  22. 499
  23. 266
  24. 555
  25. 485
  26. 268
  27. 411
  28. 241
  29. 169
  30. 81
  31. 262
  32. 270
  33. 241
  34. 404
  35. 351
  36. 408
  37. 200
  38. 180
  39. 77
  40. 330

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