Answer :
make them all decimals or all fractions with the same denominator and it will be easy to tell by inspection which is least.
43/50= .86
.91=.91
7/8= .875
84%=.84
84%. 43/50. 7/8. .91
43/50= .86
.91=.91
7/8= .875
84%=.84
84%. 43/50. 7/8. .91