Representing and interpreting data, length-measuring; decimals, ratio.

Resources: Measuring tape, string, record table (see below), calculator (optional)

Activity: Instruct the students to work in pairs and measure both their height and their arm span( measure from finger tip to finger tip and from head to foot). Collect the student data by writing it on the board. Pupils, in pairs, copy the data to their worksheets then count the average and the ratio. Draw the graph (height y-axis, arm span x-axis) and analyse it.