C. The result of the addition or subtraction will always be in simplest form. Yes the least common denominator is used in adding or subtracting fractions, is the result always a fraction in simplest form? No

\( (-\frac{8}{9}).(-\frac{27}{2}) \)

Mrs. Andrew's classroom has 4 rows of desks with 3 desks in each row. She placed 2 pencils on each desk. How many pencils did Mrs. Andrew place on the desks altogether?

15. \( \frac{1}{15}+\frac{6}{5} \div \frac{12}{7} \)

b) \( 1 \div \frac{2}{9} \)

Test Practice 17. Becka made 2 cards. She drew 3 balloons on each card. Each balloon had 3 stars. How many stars did Beckg use on her cards altogether? \( \begin{array}{ll}\text { (A) } 15 \text { stars } & \text { (C) } 17 \text { stars } \\ \text { (B) } 16 \text { stars } & \text { (D) } 18 \text { stars }\end{array} \)