# Resources by The Virtual Textbook

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### Correlation

The first sheet of this excel file shows a set of data in a scatter plot. The line of best fit can be drawn and a description of the type of correlation can be revealed along with the equation of the trend line. The other sheet shows the value of cars at various ages. The scatter plot shows the data and there are a...

### Cosine Rule

The first sheet of this interactive excel file shows a triangle ABC with the lengths of appropriate sides labelled a, b, and c. The six versions of the Cosine Rule are shown with each side and the cosine of each angle as the subject of the formula.

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### Count, Read and Order Whole Numbers Up To 100

This series of interactive excel sheets aimed at students in Year Two looks at counting, reading and ordering whole numbers up to 100. Answers can be checked each time and new questions generated at the click of a button. To return to the menu page click on the musical...

### Count, Read and Order Whole Numbers Up To 1000

This series of interactive excel sheets aimed at students in Year Three look at counting, reading and ordering whole numbers up to 1000. Answers can be checked each time and new questions generated at the click of a button.

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### Count, Read, Order, and Compare

This series of interactive excel sheets, aimed at students in Year One, looks at counting, reading ordering and comparing numbers. Answers can be checked each time and new questions generated at the click of a button. To return to the menu click on the musical note...

### Countdown

This excel file has two interactive sheets, both showing variations of the Countdown game. The first shows a grid for a set of nine letters to be selected, either vowel or consonant. There is a 30 second timer to allow students time to make their longest word.

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### Cubics (Factorising and Graphing)

This interactive excel program enables students to investigate cubic functions and the relationship between the factorised form and the graph.

The first activities require the student to use the factor theorem to...

### Cuboids

This interactive excel file begins with a sheet showing the dimensions of a cuboid beside an oblique drawing of the cuboid. The student needs to calculate the area of the three different faces, the total surface area and the volume of the cuboid. The dimensions can be...

### Cumulative Frequency

The first two sheets of this excel file shows sets of data about the weight of cows in two herds. The cumulative frequencies can be revealed and the quartiles and median are shown derived from the cumulative frequency graph. The next sheet shows the comparison of the two herds as shown by the box and whisker...

### Data Sets: Calculating an Estimate of the Mean

The first sheet of this excel file shows the number of passengers per flight from London to Paris. The raw data is shown in a grouped frequency table and the midpoint of each group can be revealed as well as each stage in the calculation of the estimate of the mean. The next two sheets each show two sets of data...