← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 791 · 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. 1.294 + 28 =
  2. 2.54 + 88 =
  3. 3.132 + 37 =
  4. 4.414 + 17 =
  5. 5.120 + 38 =
  6. 6.204 + 29 =
  7. 7.431 + 38 =
  8. 8.392 + 99 =
  9. 9.479 + 89 =
  10. 10.336 + 48 =
  11. 11.232 + 29 =
  12. 12.445 + 67 =
  13. 13.36 + 98 =
  14. 14.307 + 58 =
  15. 15.26 + 28 =
  16. 16.268 + 19 =
  17. 17.426 + 27 =
  18. 18.177 + 48 =
  19. 19.238 + 79 =
  20. 20.107 + 37 =
  21. 21.461 + 67 =
  22. 22.292 + 39 =
  23. 23.134 + 67 =
  24. 24.358 + 67 =
  25. 25.180 + 88 =
  26. 26.146 + 68 =
  27. 27.243 + 18 =
  28. 28.261 + 37 =
  29. 29.396 + 48 =
  30. 30.212 + 38 =
  31. 31.309 + 77 =
  32. 32.470 + 18 =
  33. 33.55 + 27 =
  34. 34.133 + 48 =
  35. 35.159 + 97 =
  36. 36.381 + 89 =
  37. 37.69 + 19 =
  38. 38.422 + 78 =
  39. 39.235 + 87 =
  40. 40.75 + 47 =

Answer key

  1. 322
  2. 142
  3. 169
  4. 431
  5. 158
  6. 233
  7. 469
  8. 491
  9. 568
  10. 384
  11. 261
  12. 512
  13. 134
  14. 365
  15. 54
  16. 287
  17. 453
  18. 225
  19. 317
  20. 144
  21. 528
  22. 331
  23. 201
  24. 425
  25. 268
  26. 214
  27. 261
  28. 298
  29. 444
  30. 250
  31. 386
  32. 488
  33. 82
  34. 181
  35. 256
  36. 470
  37. 88
  38. 500
  39. 322
  40. 122

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