b. \( 2 \times 8+4 \div 4-\frac{6}{4} \times 4= \)

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

Evaluate \(\sqrt ( \frac { 0.0961} { 4.0836- 3.7112} ) \) , correct to four decimal places, hence write the answer in the right form. 

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

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. \( 18 \div(6+3)-12= \)