Count the ones with 3 first.

There are 3, 13, 23, 33, 43 in the unit. . . . . . . . . . . . 293. There is 3* 10=30.

There are 3 digits in the ten digits, but there are 3*9=27 digits that are not 3.

100, and 3 of them are 1.

So there are 30+27+ 1=58 * * and 3.

So there are 300-58=242 numbers without math 3.