To find #1 6/7# as a decimal, work out the decimal part by dividing:
#6div 7 = 0.857142857.....# this an infinite recurring decimal.
#1 6/7 = 1.857142857...#
TO round to #2# decimal places, look at the digit in the #3rd# decimal place.
If it is #5# or more, then the #2nd# decimal will round UP.
If it is #4# or less, then the #2nd# decimal will stay the same.
#1 6/7 = 1.85color(red)(7)142857... rarr = 1.8color(red)(6)#