### Prompt Cards

These two group activities use mathematical reasoning - one is numerical, one geometric.

### Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

### Exploring Wild & Wonderful Number Patterns

EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.

# Difference

### Why do this problem?

This problem is a very challenging way of practising subtraction at the same time as being logical about arranging the numbers. The idea of 'difference' can be hard for children to grasp and this tricky problem is a way of coming to terms with it.

### Possible approach

Read the question together and discuss what 'difference' between two numbers means. Try one or two examples like the 5 and 6 given in the problem, making sure that you begin with both the larger and the smaller number. For learners who have met negative numbers it is important to point out that for the purposes of this problem, the difference is always positive. For learners who need quick success, or find puzzling out problems difficult, you could start with this simpler problem.

After the introduction learners could work in pairs on paper or with this interactivity . Have rough paper available for jottings or use this sheet for working and recording. If you want a whole class to work on the problem at the same time, this sheet gives the pyramid of circles, the numbers from 1 to 10 to cut out and leaves space for adding another row of circles should this be required.

The plenary can be used to discuss whether there are different solutions, possibly using the interactivity.

### Key questions

Where could the largest number be? Why?