Use prime-factorization to find the greatest common divisor (also called greatest common factor) and least common multiple of 336 and 252 . \( \operatorname{gcd}(336,252)=\square \) \( \operatorname{lcm}(336,252)=\square \)

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

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? \( \begin{array}{ll}\text { (A) } 15 \text { stars } & \text { (C) } 17 \text { stars } \\ \text { (B) } 16 \text { stars } & \text { (D) } 18 \text { stars }\end{array} \)

2. Pasar de decimal a racional (Fracción Generatriz) a) 3,235

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

E 4 Litun : DIG DEEPER! You can complete one-half of a job in an hour. Your friend can complete one-third of the same job in an hour. How long will it take to complete the job if you work together? Write your answer as a decimal. The job will take hour(s).