value?

ans is 2
exp can be written as
[(1+1/3)*(2/3)*(1+1/8)]/[(3/4)*(4/5)*(.8333)
=[(4/3)*(2/3)*(9/8)]/[(3/5)*.8333]
=5/(3*.8333)
=approx5/2.4999
=5/2.5
=50/25
=2

what if you don't know the fractions by heart?

IMO it is advisable to remember fractional value of 2,3,4,5,6,7,8,9 at least for the test bcoz these type of q are ment to eat your time.

other methods needs some smart way to calcukate like round off equally in the numerator and equally in the denominator.as

[1.3(rounded off to 1 dec place)*.7*1.1]/.8*.8*.8=1.001/.512= again round off gives 1000/500[approx]=2

but if options are very close then this method may lead to a wrong ans.

but in any case do the whole multiplication only if u are able to finish it in time of 1.5 min.