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Bar chart: A 9, B 4, C 7, D 6; how many in all

Step by step, with the reason for every step · Bar charts and dot plots · Statistics

Step by step

The question

Question: draw a bar chart of A 9, B 4, C 7 and D 6.

How many in all?

A 9, B 4, C 7, D 6

1 Draw the axes

The names go along the bottom.

The numbers go up the side.

The side counts in 1s, starting at 0.

Careful!

The side always starts at 0.

Then the bars compare fairly.

Careful: the side starts at 0

2 Draw the bars

A: 9.

Its bar goes up to 9 on the side.

B: 4.

C: 7.

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

3 Read the chart

In all: we add the bars.

9 plus 4 plus 7 plus 6 is 26.

= 9 + 4 + 7 + 6 = 26

4 Check

Let's check in two parts: the first two make 13, the rest make 13.

13 plus 13 is 26.

So it is right!

13 + 13 = 26

Let's look back.

First: draw the axes.

Then: draw the bars.

Then: read the chart.

Last: check.

Answer
= 9 + 4 + 7 + 6 = 26

Your turn

Try this one yourself, then check:

A 7, B 1, C 9, D 4. How many in all?
Show the answer
7 + 1 + 9 + 4 = 21

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