Data:
Fraction of the chalkboard = [tex] \frac{1}{5} [/tex]
classmate = 4
Fraction that each classmate decorated = ?
Solving:
[tex] \frac{1}{5}\div4 \to \frac{ \frac{1}{5} }{4} = \frac{1}{5}* \frac{1}{4} = \boxed{\boxed{\frac{1}{20}}} \end{array}}\qquad\quad\checkmark[/tex]
Fraction that each classmate decorated = [tex] \frac{1}{20} [/tex]