← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 719 · 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. 1.428 + 89 =
  2. 2.130 + 67 =
  3. 3.98 + 59 =
  4. 4.84 + 17 =
  5. 5.101 + 88 =
  6. 6.84 + 27 =
  7. 7.194 + 58 =
  8. 8.294 + 18 =
  9. 9.463 + 47 =
  10. 10.394 + 38 =
  11. 11.388 + 38 =
  12. 12.257 + 39 =
  13. 13.257 + 57 =
  14. 14.112 + 49 =
  15. 15.87 + 87 =
  16. 16.58 + 38 =
  17. 17.403 + 97 =
  18. 18.300 + 29 =
  19. 19.123 + 38 =
  20. 20.483 + 37 =
  21. 21.101 + 98 =
  22. 22.309 + 98 =
  23. 23.103 + 47 =
  24. 24.93 + 49 =
  25. 25.128 + 38 =
  26. 26.148 + 78 =
  27. 27.486 + 48 =
  28. 28.126 + 27 =
  29. 29.247 + 39 =
  30. 30.225 + 48 =
  31. 31.351 + 27 =
  32. 32.172 + 37 =
  33. 33.135 + 59 =
  34. 34.179 + 37 =
  35. 35.206 + 47 =
  36. 36.454 + 17 =
  37. 37.168 + 37 =
  38. 38.56 + 68 =
  39. 39.400 + 88 =
  40. 40.458 + 47 =

Answer key

  1. 517
  2. 197
  3. 157
  4. 101
  5. 189
  6. 111
  7. 252
  8. 312
  9. 510
  10. 432
  11. 426
  12. 296
  13. 314
  14. 161
  15. 174
  16. 96
  17. 500
  18. 329
  19. 161
  20. 520
  21. 199
  22. 407
  23. 150
  24. 142
  25. 166
  26. 226
  27. 534
  28. 153
  29. 286
  30. 273
  31. 378
  32. 209
  33. 194
  34. 216
  35. 253
  36. 471
  37. 205
  38. 124
  39. 488
  40. 505

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