(12) Stretch Your Thinking Xavier is using square tiles to cover a table top. The tiles are \( 1 \frac{1}{2} \) in. on each side. The table top is \( 7 \frac{1}{2} \) inches wide and \( 13 \frac{1}{2} \) inches long. How many tiles does Xavier need to use to cover the whole table? Explain.

5. Box \( A \) has a mass of \( 3 \frac{3}{8} \mathrm{~kg} \). The mass of Box \( B \) is \( \frac{5}{6} \) the mass of Box \( A \). How much heavier is Box \( A \) than Box \( B \) ?

Сравните числа: \( \begin{array}{lll}\text { а) } \frac{11}{20} \text { и } \frac{7}{12} ; & \text { б) } \frac{11}{18} \text { и } \frac{11}{19} ; & \text { в) } 0,48 \text { и } \frac{25}{24}\end{array} \)

b) \( 4 / \frac{1}{2} \)

1. \( 12 \frac{3}{2} \) of a sum of moncy is \( \$ 60 \). What is the sum of money? \( \begin{array}{llll}\text { (A) } \$ 7.50 & \text { (B) } \$ 20.83 & \text { (C) } \$ 72.50 & \text { (if) } 5480.00\end{array} \) ; 2. There are 40 students in a class. Boys make up \( 40 \% \) of the class. If \( 25 \% \) of the boys wear shirts jacs, how many boys wear shirt jacs? \( \begin{array}{llll}\text { (2) } 4 & \text { (B) } 10 & \text { (C) } 16 & \text { (D) } 30\end{array} \)

9. \( \frac{(-3)^{6} \cdot 27^{3}}{81^{2} \cdot 243} \) ifadəsinin qiymətini hesa