**"Averages (mean median mode)"**

This baobab tree in Senegal is reported to be 6000 years old.

Try to estimate the distance around the tree trunk at its base measured in metres.

Does this picture give you an idea how you might use the picture, with your class at school, to work out a better estimate […]

## Grades 8-9 Mean, median, mode and range

*By Ben Walker On 6 December, 2016 · Leave a Comment*

Is the answer 3, 3,5 or 5? Make three columns on a large sheet of paper, and label them 3; 3,5; and 5. Look at the words and numbers on the small cards and work out what the answer is. Place each card in the appropriate column.

The teacher leads a discussion about the […]

## Grades 8 to 11 – M, M and M

*By toni On 23 November, 2016 · 7 Comments*

Can you find all the sets of five positive whole numbers that have

a mean of 4

a median of 3

and a mode of 3?

One solution is 3, 3, 3 ,5 and 6 and there are several other solutions.

When you have found some solutions make […]

## Grades 7 to 12 Match the Matches

*By toni On 18 October, 2016 · Leave a Comment*

Two teams Alpha United and Beta Rovers have each played 15 matches.

The data shows how many goals the teams scored in their matches.

There are six sets of data, three showing the results for Alpha United and three for Beta Rovers.

Match the data to the teams and explain your answers.

[…]

## Grades 9 to 12 – For Richer for Poorer

*By toni On 3 June, 2014 · 2 Comments*

In Durban the average salary is R160,000 and in Cape Town it is R180,000. Mdu moved from Cape Town to Durban.

Mdu has made both cities richer because the average salary has gone up in both due to his move. Can you explain how that could happen?

Describe what is needed for one person moving […]

## Grades 5 to 9 For Younger for Older

*By toni On 2 June, 2014 · Leave a Comment*

When you click on ‘Continue Reading’ you see tables showing the ages of two groups of children. Find the average (mean) age in each group.

If Abe leaves his group what happens to the average age in the group?

If Chris leaves the group instead what happens to the average?

If Erin leaves the […]

## Years 9 to 11 Seven Consecutive Numbers

*By toni On 10 March, 2012 · 9 Comments*

Start with the set of the twenty-one numbers 0 – 20.

Can you arrange these numbers into 7 subsets, each of three numbers, so that the totals of the three numbers in each subset make seven consecutive numbers?

For example, one subset adding up to 27 might be {0, 13, 14}. […]

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