# Glossary

A many-to-one data display shows one icon or picture on the graph for more than one item. For example, a picture graph may use one image of a bottle to represent 10 bottles of drink.

In the measurement division model, the divisor indicates the size of the subset (number in each group) and the quotient is the number of equal sized subsets. For 12 ÷ 3 = 4, 12 is divided into groups of 3, and 4 is the number of groups of 3. The measurement division model is sometimes described as quotative division.

The value in a set of ordered data that divides the data into two parts. It is frequently called the ‘middle value’.

Where the number of observations is odd, the median is the middle value.

For example, for the following ordered data set with an odd number of observations, the median value is five.

1 3 3 4 5 6 8 9 9

Where the number of observations is even, the median is calculated as the mean of the two central values.

For example, in the following ordered data set, the two central values are 5 and 6, and median value is the mean of these two values, 5.5

1 3 3 4 5 6 8 9 9 10

A period of a thousand years.

Situations involving groups of groups where each element of one group is associated with all of the elements of the other group. For example, determining how many apples are in 3 bags of apples if each bag has 12 apples. Multiplicative situations are problems or contexts that involve multiplication (or division). Calculating the number of seats in a theatre that has 30 rows of 24 seats, finding equivalent fractions, and working with ratios and percentages are all multiplicative situations.