**"Graphs"**

## Grades 10 to 12 Tangled Trig Graphs

*By toni On 17 July, 2017 · Leave a Comment*

Graph 1 is the graph y=sinx. Can you identify the coordinates of the points where it crosses the axes and where it reaches its maximum and its minimum values?

How could I make graph 2 from graph 1? Can you work out the equation of graph 2?

Graph 3 has equation y=sin2x. […]

## Grades 10-11 Financial maths

*By Ben Walker On 9 January, 2017 · Leave a Comment*

Comparing investments: there are six investments. Find all the representations (description, formula, graph and table of values) of a single investment. After this, work out which statement fits with which investment.

The teacher leads a very short discussion about the different types of investments, reminding the learners about simple and compound interest. He or […]

## Grades 10-12 Distance-time graphs

*By Ben Walker On 9 January, 2017 · Leave a Comment*

This lesson is about moving between different representations of distance-time functions, namely between graphs, stories and tables. This activity should be given to the class as a formative assessment activity: it is designed to provide the teacher with information about the learners’ current levels of understanding.

During a short introduction the teacher displays a […]

## Grades 7 to 10 Car Racing

*By toni On 23 November, 2016 · Leave a Comment*

The graph shows the distance along a race track for two racing cars as they approach a bend in a race. Copy the table below, take readings from the graph and fill in the table for the first 10 seconds.

How far does each car go in the 3rd second? How far […]

## Grades 7 to 10 Best Representation

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

The ages of children arriving at a zoo in 1 hour are noted by the ticket salesman. There are 12 children between 0 and 3 years old, 14 children between 4 and 10 years old and 48 between 11 and 18 years old.

He draws a bar graph or frequency diagram to represent this […]

## Grades 7 to 10 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.

See the […]

## Grades 9 to 12 SA Demographics

*By toni On 17 October, 2016 · Leave a Comment*

The table gives the 2013 population statistics for South Africa.

Complete the table and draw a histogram to represent this data. Comment on the distribution.

Remember that for a histogram the area in each column represents the frequency for that class.

You can see that almost half the population is under 25 years old. […]

## Grade 9 and 10 – Intersections

*By toni On 17 October, 2016 · Leave a Comment*

(1) Plot the graphs of the straight lines y = x, y = 1.1x – 0.2 and y = 0.9x – 0.1

What do the graphs tell you about the solutions to the two pairs of simultaneous equations y = x y = 1.1x – 0.2 and y = x y = 0.9x – 0.1 […]

## Grades 7 to 10 Histogram

*By toni On 17 October, 2016 · Leave a Comment*

The histogram shows the number of children in each age group on a school bus. There are no children under 5 years and no children over 17 years. There are 6 children aged between 5 and 10 years . Explain why the class boundaries are 5, 11, 16 and 18. Complete the following table. […]

## Grades 9 to 12 – Dating Made Easier

*By toni On 30 August, 2016 · Leave a Comment*

If a sum invested gains 10% each year how long will it be before it has doubled its value?

If an object depreciates in value by 10% each year how long will it take until only half of the original value remains?

Why aren’t these two answers the same?

Is there a rate, used […]

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