26 cm is what percent of 33 cm ?

Calculate \( \left(2.9 \times 10^{6}\right)-\left(7.5 \times 10^{5}\right) \) Give your answer in standard form

6. Six classes, each with 38 pupils, went on an excursion. If one teacher way required to supervise 15 pupils, how many teachers were needed on the excursion?

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? \( \begin{array}{llll}\text { (2) } 4 & \text { (B) } 10 & \text { (C) } 16 & \text { (D) } 30\end{array} \)

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

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