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Lesson · Grade 4 · Mathematics

Graphs Where One Symbol Stands for Many

  • Grade 4
  • Mathematics
  • 1 min 12 s
  • British Columbia
  • BC4-MA-26

Twenty cat votes start as one small picture per child, then a key of 1 picture = 5 children turns each group of five into one picture, and counting by 5s checks every row: 20 cats, 15 dogs and 10 fish. Each picture then becomes one square of a bar graph whose scale counts by 5s, so the bars end at 15, 20 and 10, the same as the pictograph.

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In one sentence

The question this lesson answers

Each child chose a favourite pet: a dog, a cat or a fish.

Twenty children chose a cat.

Transcript

What the lesson says

Each child chose a favourite pet: a dog, a cat or a fish.

Twenty children chose a cat.

One picture for each child makes a very long row.

So the key says one picture stands for five children.

Put the twenty children into four groups of five.

Each group of five becomes one picture.

Count by fives: five, ten, fifteen, twenty.

How many children chose a dog?

Count by fives: five, ten, fifteen.

Two pictures for fish make ten children.

Now each picture becomes one square, to make a bar graph.

Each square is five children, so the scale counts by fives.

The bars end at fifteen, twenty and ten, the same as before.

Check the key or the scale, because one symbol can stand for many.

Curriculum

Where this fits

British Columbia, Grade 4

Mathematics, Data and probability: one-to-one correspondence and many-to-one correspondence, using bar graphs and pictographsBC4-MA-26

Next: Probability Experiments: Predict, Spin and Tally

The outcomes and strands follow the British Columbia curriculum.

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