Grasp Maths

Year 2

Interpret and construct simple pictograms, tally charts, block diagrams and simple tables

Read and organise small sets of data using pictograms, tallies and tables.

Lesson overview

Statistics

Charts and tables help us organise information so it is easier to read. A tally chart records counts. A pictogram uses symbols. A table keeps the categories and totals in rows and columns.

Read a pictogram

Count the symbols in each row to find the total.

Key: each square stands for 1 choice

Each symbol stands for 1 in this simple pictogram.

Read a tally table

The tally marks and total show the same amount.

FruitTallyTotal
Apples||||4
Bananas||2
Pears|||3

Count the tally marks carefully before checking the total.

Compare categories

Apples have the greatest total in this chart.

CategoryApples

4 choices

CategoryPears

3 choices

CategoryBananas

2 choices

The greatest total is the row with the largest count.

Worked example

How many children chose pears?

Key: each square stands for 1 choice

FruitTallyTotal
Apples||||4
Bananas||2
Pears|||3
  1. Find the pears row in the chart or table.
  2. Count the symbols or tally marks.
  3. There are 3.
  4. So 3 children chose pears.

Try it

Use the pictogram or table to count each category carefully.

Question 1

How many children chose dogs?

Key: each square stands for 1 choice

Question 2

Which animal was chosen the least?

AnimalTallyTotal
Dogs|||||5
Cats||2
Birds||||4
Question 3

Write the total for birds.

Key: each square stands for 1 choice

Question 4

Which statement is correct?

AnimalTallyTotal
Dogs|||||5
Cats||2
Birds||||4
Question 5

What does the key tell you?

Key: each square stands for 1 choice

Common mistakes

Watch for these when working through the lesson.

  • Counting the heading or key as part of the data.
  • Reading the wrong row for the category.
  • Forgetting to check whether the symbol key is 1 or more than 1.

Related topics

These ideas fit closely with this lesson.

  • Ask and answer simple questions by counting the number of objects in each category and by comparing categories.
  • Compare and order numbers from 0 up to 100; use <, > and = signs.

Practice next

Keep practising this idea

Review keys and frequencies, then interpret the data check.