Statistics · Data representation
Chapter 1 · 3
The idea
Tally charts, frequency tables and pictograms
Count with tally marks into a frequency table, then show the counts as a pictogram where one symbol stands for several things. How to read whole and part symbols with the key, work out how many symbols to draw, find a missing key, choose a sensible one, work out totals, differences and a missing row, compare a pictogram with a bar chart, and spot a pictogram that misleads.
A full journey — read it, play with it, work it, then earn real exam marks. Everything stays on the timeline below.
In this lesson — start anywhere
Statistics · Data representation
Tally charts, frequency tables and pictograms
Count with tally marks into a frequency table, then show the counts as a pictogram where one symbol stands for several things. How to read whole and part symbols with the key, work out how many symbols to draw, find a missing key, choose a sensible one, work out totals, differences and a missing row, compare a pictogram with a bar chart, and spot a pictogram that misleads.
Why it works
Counting with a tally chart
Amara runs the cake stall at her school's summer fair. Next year she wants to bake more of whatever sells best. With a queue waiting, there is no time to write numbers, so she keeps a tally: a mark next to a cake's name each time she sells one.Marks go in groups of five: four side by side, and the fifth across them like a gate. Count the gates in fives, then add the marks left over.
Keep reading — free
The rest of the explanation, plus 4 worked examples you step through move by move.
Start freeTakes a minute — no card.