Ben has four boxes with ten basketball cards in each box. His mother gave him five boxes with eight baseball cards.  If he gives 58 cards to his classmates, how many cards does he has left?
How many cards does Ben have? ** Ben has 4 x 10 = <<4*10=40>>40 basketball cards.
How many cards did his mother give him? ** His mother gave him 5 x 8 = <<5*8=40>>40 baseball cards.
How many cards does Ben have? ** Thus, Ben has 40 + 40 = <<40+40=80>>80 cards in all.
How many cards does Ben have left? ** Therefore, Ben has 80 - 58 = <<80-58=22>>22 cards left.
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