← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 426 · 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. 1.59 + 17 =
  2. 2.341 + 97 =
  3. 3.477 + 48 =
  4. 4.314 + 87 =
  5. 5.117 + 79 =
  6. 6.328 + 99 =
  7. 7.365 + 88 =
  8. 8.371 + 98 =
  9. 9.310 + 47 =
  10. 10.62 + 79 =
  11. 11.473 + 48 =
  12. 12.73 + 18 =
  13. 13.297 + 59 =
  14. 14.179 + 77 =
  15. 15.69 + 27 =
  16. 16.165 + 27 =
  17. 17.29 + 57 =
  18. 18.469 + 67 =
  19. 19.31 + 58 =
  20. 20.338 + 37 =
  21. 21.111 + 59 =
  22. 22.137 + 88 =
  23. 23.301 + 29 =
  24. 24.498 + 67 =
  25. 25.345 + 47 =
  26. 26.179 + 37 =
  27. 27.292 + 19 =
  28. 28.498 + 77 =
  29. 29.72 + 69 =
  30. 30.218 + 17 =
  31. 31.382 + 28 =
  32. 32.285 + 27 =
  33. 33.267 + 29 =
  34. 34.138 + 48 =
  35. 35.83 + 97 =
  36. 36.140 + 57 =
  37. 37.345 + 88 =
  38. 38.349 + 97 =
  39. 39.72 + 37 =
  40. 40.293 + 18 =

Answer key

  1. 76
  2. 438
  3. 525
  4. 401
  5. 196
  6. 427
  7. 453
  8. 469
  9. 357
  10. 141
  11. 521
  12. 91
  13. 356
  14. 256
  15. 96
  16. 192
  17. 86
  18. 536
  19. 89
  20. 375
  21. 170
  22. 225
  23. 330
  24. 565
  25. 392
  26. 216
  27. 311
  28. 575
  29. 141
  30. 235
  31. 410
  32. 312
  33. 296
  34. 186
  35. 180
  36. 197
  37. 433
  38. 446
  39. 109
  40. 311

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