Seven eighths by one fifth by two fifths?

Seven eighths by one fifth by two fifths?


7/8x1/5x2/5
=7/40x2/5
=7/100



What is 5.58 minus 3 / 8 plus 5.42 minus 2 / 5


5.58-3/8+5.42-2/5
=5.58+5.42-0.4-3/8
=11-0.4-3/8
=10.6-3/8
=10.225