Data — South Australian Year 3 Maths
Tally marks and frequency tables, one-to-one picture graphs and column graphs, then guided statistical investigations. Four subtopics and 80 practice questions, aligned to AC9M3ST01, AC9M3ST02 and AC9M3ST03.
Data in South Australian Year 3
Data is the information you collect to answer a question. In this topic students record answers with tally marks, organise them in frequency tables, show them in picture graphs and column graphs, and follow the steps of an investigation to answer a question of their own.
The four subtopics below are Collect and organise data (tally and tables), Construct and interpret picture graphs (one-to-one), Construct and interpret column graphs and Guided statistical investigations. Data is one of the 18 topics in South Australian Year 3 Maths and belongs to the Statistics strand. The work comes under Australian Curriculum codes AC9M3ST01, AC9M3ST02 and AC9M3ST03. These skills lead on to more kinds of graphs and to comparing data sets in Year 4.
Subtopics
Data: common questions
How do tally marks work?
Draw one stroke for each answer and cross every fifth stroke through the first four, so the marks sit in groups of five. To read a tally, count the groups by fives and add the extra strokes: three groups and 2 strokes is \(15 + 2 = 17\).
What is the difference between a picture graph and a column graph?
A picture graph uses rows of pictures, and the key says what one picture stands for; in Year 3 each picture stands for one thing. A column graph uses columns against a number scale that starts at 0 and goes up in equal steps, so the height of each column shows the count.
How do you read a column graph with a scale of twos?
Find where the top of the column meets the scale. If it stops halfway between 10 and 12, it shows 11. To draw a column for 16 on a scale of twos, make it 8 marks tall.
How can children practise data at home?
Choose a question, such as which fruit the family likes best or what colour the cars driving past are. Collect the answers with tally marks, make a table and draw a picture graph or column graph. Then ask which was most popular, and how many more chose it than the least popular.
Which curriculum codes cover Data in South Australian Year 3?
Collect and organise data comes under Australian Curriculum v9 code AC9M3ST01, picture graphs and column graphs come under AC9M3ST02, and guided investigations come under AC9M3ST03.