Pictograms and block graphs · Usually met around P2
Doing a survey
Question, collect, record; tally marks in fives.
How to do it
Method
Question, collect, record; tally marks in fives
Two bundles of five and 2 marks: 5 + 5 + 2 = 12 votes
Another way
Add up to check
All the votes added up = the people asked
In full
A survey has three steps. First decide the question: one where everyone can pick one answer from a few choices, like “Which fruit do you like best?” Then collect the data: ask everyone, and each person picks just one. Last, record it in a tally chart: one mark for each person's choice, with every fifth mark crossing the four before it into a bundle of five, which is easy to count. When you add up the choices, the total should match the number of people asked, which checks that no one was missed.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
A tally chart shows 2 bundles of five and 0 more single marks. How many votes is that?
Show the answer and working
Answer: 10
Each bundle is 5 marks, 5 votes: count in fives 2 times and add 0, 10 votes.
Example 2
Chi-keung asks some friends their favourite colour, one each: red 6, blue 10, green 6. How many people did Chi-keung ask?
Show the answer and working
Answer: 22
Each person picks one, so the choices add up to the people asked: 6 + 10 + 6 = 22.
Example 3
Tsz-hin wants to record the favourite sport of 25 friends, one each. Which way of recording is best?
- A. Write down only the sport most people pick
- B. A row for each sport, with a mark in its row for each person who picks it
- C. Write down each friend's height
- D. Ask only the first friend and write down the answer
Choose the right answer
Show the answer and working
Answer: B. A row for each sport, with a mark in its row for each person who picks it
A row a choice and a mark a person; count each row at the end, and they should add up to 25.
Practise it in the game →Pictograms and block graphs · Free to start, unlimited questions, no download