← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 343 · 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. 1.347 + 59 =
  2. 2.69 + 69 =
  3. 3.233 + 88 =
  4. 4.370 + 67 =
  5. 5.117 + 38 =
  6. 6.433 + 67 =
  7. 7.322 + 77 =
  8. 8.216 + 37 =
  9. 9.427 + 59 =
  10. 10.301 + 79 =
  11. 11.159 + 18 =
  12. 12.133 + 39 =
  13. 13.83 + 48 =
  14. 14.70 + 48 =
  15. 15.487 + 78 =
  16. 16.30 + 17 =
  17. 17.497 + 18 =
  18. 18.265 + 29 =
  19. 19.144 + 59 =
  20. 20.481 + 49 =
  21. 21.419 + 97 =
  22. 22.384 + 39 =
  23. 23.91 + 78 =
  24. 24.444 + 39 =
  25. 25.214 + 27 =
  26. 26.406 + 37 =
  27. 27.37 + 37 =
  28. 28.359 + 59 =
  29. 29.429 + 69 =
  30. 30.98 + 79 =
  31. 31.310 + 77 =
  32. 32.427 + 27 =
  33. 33.288 + 87 =
  34. 34.384 + 17 =
  35. 35.201 + 57 =
  36. 36.31 + 78 =
  37. 37.157 + 69 =
  38. 38.132 + 37 =
  39. 39.258 + 27 =
  40. 40.249 + 97 =

Answer key

  1. 406
  2. 138
  3. 321
  4. 437
  5. 155
  6. 500
  7. 399
  8. 253
  9. 486
  10. 380
  11. 177
  12. 172
  13. 131
  14. 118
  15. 565
  16. 47
  17. 515
  18. 294
  19. 203
  20. 530
  21. 516
  22. 423
  23. 169
  24. 483
  25. 241
  26. 443
  27. 74
  28. 418
  29. 498
  30. 177
  31. 387
  32. 454
  33. 375
  34. 401
  35. 258
  36. 109
  37. 226
  38. 169
  39. 285
  40. 346

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths