# Resources by Durham County Council

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### Algebra Mystery

This resource written by Shirley Fall has thirteen cards each with a statement about algebraic expressions and how they lie on a 3 by 3 grid. The rationale is for students to discuss possible options and work towards a solution of which algebraic expression lies in each...

### Directed Numbers Mystery

This resource written by Shirley Fall has thirteen cards each with a statement about directed numbers and how they lie on a 3 by 3 grid. The rationale is for students to discuss possible options and work towards a solution of which directed number lies in each of the grid cells.

The file named Directed...

### Durham Maths Mysteries

The Durham Maths Mysteries were written by Shirley Fall of Durham County Council as a resource to engage students in mathematics and promote discussion. The activities are based on cards with statements about the area of mathematics being covered. Students then have to use reasoning to decide how to tackle the task...

### Graphs mystery

This Durham Maths Mystery is designed to extend high achieving GCSE students and for use with students studying mathematics post-16.

Task 1A: students are presented with a blank three by three grid and twenty fact cards. Students have to use the clues on the fact cards to help them sketch...

### Locus Mystery

This resource written by Shirley Fall focuses on constructing loci. There are eighteen cards with statements about an area of land centred on a four-sided field reputed once to have belonged to a notorious highwayman. Students are asked to discuss in groups and use the...

### Probability Mystery

This resource, written by Shirley Fall, has fourteen cards with statements about the likelihood of six different runners winning a race. Students are tasked with using the statements on the cards to determine who is most likely to win the race, with what probability, and in what sequence they would expect the...

### Properties of Shape Mystery

This resource written by Shirley Fall has fifteen cards each with a statement about 2-D shapes and how they lie on a 3 by 3 grid. The rationale is for students to discuss the possible options and work towards a solution of which 2-D shape lies in each of the grid cells. Extension questions are also posed.

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### Ratio and Proportion Mystery

This resource written by Shirley Fall has eleven cards, each with a statement about how some students have performed in two papers of a mathematics test. Students are tasked to decide who should get the mathematics prize by working out their rank order. It is suggested that students draw up a table to show each...

### Straight Line Graphs Mystery

This resource created by Shirley Fall has twenty mystery fact cards, each containing a statement about the features of straight line graphs and how they lie on a 3 by 3 grid. The rationale is for students to use the fact cards to discover the features of each graph - its gradient, its intercept, its graph and...