← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 876 · 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. 1.136 + 48 =
  2. 2.91 + 98 =
  3. 3.111 + 38 =
  4. 4.27 + 19 =
  5. 5.174 + 97 =
  6. 6.29 + 49 =
  7. 7.395 + 19 =
  8. 8.367 + 87 =
  9. 9.298 + 47 =
  10. 10.348 + 18 =
  11. 11.190 + 69 =
  12. 12.233 + 27 =
  13. 13.156 + 48 =
  14. 14.29 + 68 =
  15. 15.42 + 57 =
  16. 16.223 + 79 =
  17. 17.471 + 39 =
  18. 18.353 + 77 =
  19. 19.360 + 68 =
  20. 20.384 + 17 =
  21. 21.402 + 38 =
  22. 22.197 + 47 =
  23. 23.274 + 19 =
  24. 24.110 + 27 =
  25. 25.303 + 37 =
  26. 26.154 + 78 =
  27. 27.383 + 58 =
  28. 28.317 + 28 =
  29. 29.242 + 27 =
  30. 30.116 + 47 =
  31. 31.358 + 37 =
  32. 32.288 + 39 =
  33. 33.38 + 97 =
  34. 34.444 + 29 =
  35. 35.298 + 78 =
  36. 36.131 + 89 =
  37. 37.38 + 99 =
  38. 38.481 + 68 =
  39. 39.217 + 48 =
  40. 40.143 + 37 =

Answer key

  1. 184
  2. 189
  3. 149
  4. 46
  5. 271
  6. 78
  7. 414
  8. 454
  9. 345
  10. 366
  11. 259
  12. 260
  13. 204
  14. 97
  15. 99
  16. 302
  17. 510
  18. 430
  19. 428
  20. 401
  21. 440
  22. 244
  23. 293
  24. 137
  25. 340
  26. 232
  27. 441
  28. 345
  29. 269
  30. 163
  31. 395
  32. 327
  33. 135
  34. 473
  35. 376
  36. 220
  37. 137
  38. 549
  39. 265
  40. 180

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