Data analysis; final review

We review the topics learned during the year. For natural numbers we recall the order of operations and the laws for convenient calculation. In an equation we find the unknown using the components of operations. The area of a rectangle is S = a · b, the volume of a parallelepiped is V = a · b · c, the surface of a cube is 6a². We can compare, add and subtract common fractions and find a part of a number. In decimals, operations are done carefully with the point, and numbers can be rounded. Percent is one hundredth. A data series is analysed with the mean, range, median and mode. Always check your answer.