Rule: write the decimal as a fraction with denominator 10, 100, or 1000.

Rule: simplify by dividing numerator and denominator by their HCF.

Decimal	=	0.54
Write as a fraction: 0.54 = 54/100 (54 hundredths).
Find the HCF of 54 and 100. 54 = 2 x 27, 100 = 2 x 50. HCF = 2.
Simplify	=	54/100 = (54 / 2)/(100 / 2) = 27/50
Check the options: (1) 27/50, (2) 3/10, (3) 1/2, (4) None of the above. 27/50 matches option (1).