Given the number, two-fifths, generate its equivalents forms as a fraction, a decimal, and a percent. in addition, give a real world example in which each form might be used

Two-fifths or  is equivalent to the following. 

0.4
40%

2 pizzas being shared among 5 friends is a real-world example in which each form might be used.

I hope this helps!

Decimal:  (could be used when using a ruler to count millimeters).
Fraction:  (could be used when calculating an equation with ordinary fractions).
Percentage: (could be used in chemistry to calculate upon admixtures).