Unit 9 · Topic 01 · Data Handling
The class fruit survey showed 4 and a half apple pictures next to 'Tuesday.'
Kabir asked the obvious question: how do you eat half an apple picture?
The answer was hiding in a tiny line of text at the bottom of the chart, which everyone had skipped.
Ms. Rao put up a pictograph showing how many students chose apples as their favourite fruit, one row per class. Class 5A showed 4 whole apple pictures and 1 half apple picture.
"So 4 and a half students like apples?" asked Kabir. "That doesn't make sense."
"Look at the key," said Ms. Rao, pointing to a small line at the bottom: 'Key: 🍎 = 2 students'.
"Each picture doesn't mean ONE student. It means however many the key says — here, 2 students per apple. So a half apple means half of 2, which is 1 student."
Kabir recounted: 4 whole apples × 2 students each = 8, plus the half apple = 1 more student. "8 plus 1 is 9 students total."
"Exactly. Never read a pictograph without checking the key first — the picture count alone tells you nothing."
Ms. Rao then switched to a bar graph showing the same survey, but for all five fruits: apples, bananas, mangoes, grapes, oranges. Each bar's height, read against the numbers on the side, gave the count directly — no key needed, because the height itself was the number.
"A bar graph is more precise for exact counts," said Ms. Rao, "while a pictograph is quicker to read at a glance, especially for younger readers, as long as you remember the key."
Anaya studied the bar graph. Mangoes reached the line for 12. Bananas reached 7. "Mangoes are the class favourite by a big margin."
"How many more students liked mangoes than bananas?" asked Ms. Rao.
Anaya subtracted: 12 − 7 = 5. "Five more."
"That's the real power of these charts," said Ms. Rao. "Not just reading one number, but comparing bars or picture-rows against each other to answer a real question."
A pictograph uses repeated pictures to represent data, with a KEY showing how many items each picture stands for — always check the key before reading any count.
A partial picture (like a half apple) represents a fraction of the key's value — half a picture with a key of '2 per picture' means 1 unit.
A bar graph uses bar height (read against a numbered scale) to show exact counts directly, with no key needed.
Both chart types are used to COMPARE categories against each other — which is largest, which is smallest, and by how much — not just to read one single number in isolation.
Make a pictograph of your family's favourite snacks, choosing your own key value per picture.
Draw a bar graph comparing how many hours you spend on 3 different activities in a week.
Loading questions…