KEY
Definition Of Key
A key is used to identify the number of categories present in a graph. It is also called a legend
A key on a pictograph tells us how many each picture stands for. Look at the following pictograph
Video Examples: Key Stage 1 Maths: Addition
Example of Key
In the graph shown, the key is given to the right of the graph to notify us which line graph corresponds to which hitter.
The key here is important, because otherwise we wouldn't be able to answer any question comparing the two hitter's performance.
Solved Example on Key
Ques: Find the number of keys in the graph.
Choices:
A. 1
B. 2
C. 3
D. 4
Correct Answer: B
Solution:
Step 1: From the graph, it is clear that there are two categories boys and girls
Step 2: So, the number of keys = 2
Quick Summary
- A key tells you what each part of a graph means.
- In pictographs, the key shows how many items each picture represents.
- In line graphs, the key identifies which line corresponds to which data series.
⚠️ Common Mistakes
- Ignoring the key and misinterpreting the graph's data.
- Assuming each picture in a pictograph represents one item when it might represent multiple.
🍎 Teacher Insights
When teaching about keys, use real-world examples like class attendance charts or favorite fruit graphs to make it relatable. Emphasize the importance of checking the key before interpreting any graph.🎓 Prerequisites
- Counting
- Basic understanding of graphs
- Categorization
Check Your Knowledge
Q1: In a pictograph, if a key shows one sun picture = 5 sunny days, and there are 3 sun pictures for June, how many sunny days were there?
Q2: A line graph shows the sales of two products, Product A and Product B. What is the key most likely to show?
Frequently Asked Questions
Q: What happens if a graph doesn't have a key?
A: It becomes difficult or impossible to understand what the different parts of the graph represent, making the data meaningless.
Q: Where can I usually find the key on a graph?
A: The key is usually located to the side or bottom of the graph. It's designed to be easily visible and understandable.