Find 4 rational numbers between 6/7 and 7/8

6/7, 7/8
lcm of denominators= 7*8= 56
6*8/7*8, 7*7/8*7= 48/56, 49/56= 480/560, 490/560
rational numbers= 481/560, 482/560, 483/560, 484/560...