← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 179 · 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. 1.49 + 87 =
  2. 2.363 + 79 =
  3. 3.42 + 49 =
  4. 4.156 + 29 =
  5. 5.197 + 17 =
  6. 6.115 + 38 =
  7. 7.336 + 87 =
  8. 8.302 + 68 =
  9. 9.456 + 28 =
  10. 10.334 + 27 =
  11. 11.172 + 27 =
  12. 12.134 + 88 =
  13. 13.287 + 39 =
  14. 14.447 + 18 =
  15. 15.32 + 99 =
  16. 16.403 + 87 =
  17. 17.449 + 59 =
  18. 18.198 + 99 =
  19. 19.161 + 58 =
  20. 20.220 + 37 =
  21. 21.345 + 97 =
  22. 22.79 + 59 =
  23. 23.243 + 67 =
  24. 24.46 + 67 =
  25. 25.444 + 28 =
  26. 26.91 + 97 =
  27. 27.97 + 29 =
  28. 28.134 + 99 =
  29. 29.223 + 78 =
  30. 30.382 + 99 =
  31. 31.132 + 49 =
  32. 32.358 + 47 =
  33. 33.234 + 67 =
  34. 34.193 + 28 =
  35. 35.350 + 77 =
  36. 36.468 + 77 =
  37. 37.463 + 18 =
  38. 38.401 + 58 =
  39. 39.214 + 67 =
  40. 40.392 + 99 =

Answer key

  1. 136
  2. 442
  3. 91
  4. 185
  5. 214
  6. 153
  7. 423
  8. 370
  9. 484
  10. 361
  11. 199
  12. 222
  13. 326
  14. 465
  15. 131
  16. 490
  17. 508
  18. 297
  19. 219
  20. 257
  21. 442
  22. 138
  23. 310
  24. 113
  25. 472
  26. 188
  27. 126
  28. 233
  29. 301
  30. 481
  31. 181
  32. 405
  33. 301
  34. 221
  35. 427
  36. 545
  37. 481
  38. 459
  39. 281
  40. 491

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