What are the odds against rolling a number higher than 3 on an ten-sided die?

There are 7 numbers on a ten-sided die that are higher than 3 (4, 5, 6, 7, 8, 9, 10) and a total of 10 possible outcomes.

Therefore, the odds against rolling a number higher than 3 on a ten-sided die would be 7 to 3.