Bar chart: red 7, blue 11, green 9, white 13, black 4; how many more… Step by Step

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The question

Question: draw a bar chart of red 7, blue 11, green 9, white 13 and black 4.

How many more white than black?

red 7, blue 11, green 9, white 13, black 4

1 Draw the axes

The names go along the bottom.

The numbers go up the side.

The biggest number is 13.

So the side counts in 2s, starting at 0.

Each line on the side is 2 more.

1 line = 2

2 Draw the bars

Red: 7.

Its bar goes up to 7 on the side.

7 is between 6 and 8.

Blue: 11.

11 is between 10 and 12.

Green: 9.

9 is between 8 and 10.

White: 13.

13 is between 12 and 14.

All the bars have the same width, with gaps between them.

3 Read the chart

Careful!

The side counts in 2s.

So read the number on the side, not how many squares.

Careful: read the side, not the squares

White reaches 13.

Black reaches 4.

How many more: we take away.

13 minus 4.

= white − black = 13 − 4

13 minus 4 is 9.

So there are 9 more white than black.

= white − black = 9

4 Check

Let's check: 4 plus 9 is 13.

So it is right!

4 + 9 = 13

Let's look back.

First: draw the axes.

Then: draw the bars.

Then: read the chart.

Last: check.

Answer