### What's Possible?

Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?

### What's it Worth?

There are lots of different methods to find out what the shapes are worth - how many can you find?

### Magic Squares for Special Occasions

This article explains how to make your own magic square to mark a special occasion with the special date of your choice on the top line.

# Simultaneous Multiplying

##### Stage: 4 Short Challenge Level:
See all short problems arranged by curriculum topic in the short problems collection

If $a\times b=2$, $b\times c=24$, $c\times a=3$ and $a$, $b$ and $c$ are all positive, what is the value of $a+b+c$?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.