Ben has 4 x 10 = <<4*10=40>>40 basketball cards.
His mother gave him 5 x 8 = <<5*8=40>>40 baseball cards.
Thus, Ben has 40 + 40 = <<40+40=80>>80 cards in all.
Therefore, Ben has 80 - 58 = <<80-58=22>>22 cards left.
#### 22