In Year 2 and Year 3 you met your first tally charts, pictographs and bar charts. The numbers were small — each tick mark or each picture was worth one. In Year 4 charts grow up. They start using scales bigger than one so they can fit large numbers on a small page, and you meet a brand-new kind: the line graph.
A quick reminder
A chart is a picture of data. It turns a list of numbers into something the eye can read at a glance.
Tally chart — a count, drawn as marks in groups of five.
Pictograph — each icon stands for a number (one, two, five, ten, …).
Bar chart — bars of different heights show different counts.
Line graph — points joined by lines, useful when something changes over time.
What's new this year
1. Bigger scales
In Year 3, a bar chart of "how many sweets does each child have" might go 0, 1, 2, 3, … up to maybe 10. In Year 4 we count crowds — "how many books were borrowed each month" — and the bars go up to 50, 100, even 1 000. Charts use a scale like 0, 5, 10, 15, … or 0, 10, 20, 30, … to fit the page.
You have to read the scale carefully before you can read the data.
2. Pictographs with a key
In Year 2 every picture was worth one. In Year 4 the key at the bottom tells you "one icon = 5" or "one icon = 10". Half an icon is worth half the key.
🍎 🍎 🍎 ½ — if the key says "🍎 = 10", this row stands for 35.
3. Comparison questions
Charts are most useful when we compare the values, not just read them one by one.
"Which month had the most rain?"
"How many more books were borrowed in March than in February?"
"What is the difference between the tallest and the shortest bar?"
These questions need you to read two values and then add or subtract.
4. Line graphs
A new chart this year — the line graph. The horizontal axis shows time (days, months, years), and the vertical axis shows a quantity. Each point is the value at that time, and the points are joined by straight lines.
Line graphs are perfect for showing change: temperature over a week, plant height over a month, traffic over a day.
How to read any chart
A four-step routine that works for every chart:
Read the title — what does the chart show?
Read the axis labels and the scale — what is being counted, and how big is each step?
Read the data — find the value you need (one bar, one point, one icon row).
Answer the question — sometimes just read; sometimes add, subtract or compare.
