\( 27 / 21 \) is equal to: A. \( 8 / 7 \) B. \( 6 / 3 \) C. \( 12 / 7 \) D. \( 3 / 4 \)

8. Say whether each of the following is true or false: a) \( 15+6=6+15 \) b) \( 15-6=6-15 \)

Pregunta 1 \( \frac{3}{4} \cdot \frac{2}{5}+\frac{1}{2}= \) \( \begin{array}{llll}\text { A) } 1 & \text { B) } \frac{4}{5} & \text { C) } \frac{7}{22} & \text { D) } \frac{7}{20}\end{array} \)

El orden creciente de las fracciones \( \frac{1}{3}, \frac{1}{4} \) y \( \frac{1}{5} \) es: \( \begin{array}{llll}\text { A) } \frac{1}{3}, \frac{1}{4}, \frac{1}{5} & \text { B) } \frac{1}{5}, \frac{1}{4}, \frac{1}{3} & \text { C) } \frac{1}{3}, \frac{1}{5}, \frac{1}{4} & \text { D) } \frac{1}{5}, \frac{1}{3}\end{array} \)

3) Simplifioa y Resolve a) \( \left(-\frac{121}{11}\right)\left(-\frac{22}{4}\right)\left(\frac{1}{1}\right. \) b) \( \left(\frac{150}{25}\right):\left(-\frac{15}{100}\right) \) 4) a) \( \left(1-\frac{4}{8}\right)\left(\frac{16}{4}\right)- \) b) \( \sqrt{\frac{25}{100}}-\left(\frac{1}{4}\right)^{-2}+ \)

1. Round 376 to the nearest 10