### Consecutive Numbers

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

### Calendar Capers

Choose any three by three square of dates on a calendar page...

### Days and Dates

Investigate how you can work out what day of the week your birthday will be on next year, and the year after...

# Circumference and Diameter

##### Stage: 3 Short Challenge Level:

The formula which gives in terms of is $C= \pi \times d$ , so the graph of C versus d is a straight line which passes through the origin.

This problem is taken from the UKMT Mathematical Challenges.