7. Si compras un paquete de jamón que trae 18 tajadas y un paquete de queso de 34 tajadas, ¿cuánto paquete de jamón y de queso debes comprar para tener la misma cantidad de cada uno?

mixed numbers. \( \begin{array}{ll}\text { (7) } \frac{18}{3}= & \text { (11) } \frac{19}{3}= \\ \text { (8) } \frac{10}{2}= & \text { (12) } \frac{7}{6}= \\ \text { (9) } \frac{37}{6}= & \text { (13) } \frac{55}{4}= \\ \text { (10) } \frac{27}{8}= & \text { (14) } \frac{99}{5}=\end{array} \)

If the numerical value of 5, 5.0, and 5.00 are the same, why is it necessary to include the zeros in measurements?

15. \( 1-(2-3)+8= \) 16. \( 12-4(7-2)= \) 17. \( 18 \div(6+3)-12= \)

Simplify these fractions. \( \begin{array}{ll}\text { (15) } \frac{16}{20}= & \text { (18) } \frac{9}{81}= \\ \text { (16) } \frac{4}{128}= & \text { (19) } \frac{16}{20}= \\ \text { (17) } \frac{10}{15}= & \text { (20) } \frac{30}{445}=\end{array} \)

(a) What was the TOTAL cost of the stamps? (b) She had to post a parcel and the total cost of postage was \( \$ 25.70 \). What stamps can she select from the collection, to make up this amount if she must use (i) as many \( \$ 4.00 \) stamps as possible? (ii) all her \( \$ 1.00 \) stamps? 3 marks) (c) 2 marks) (i) What is the LARGEST number of stamps that she can use from the collection (ii) List the selection of stamps she can use. 3 marks)