### Consecutive Numbers

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

### Tea Cups

Place the 16 different combinations of cup/saucer in this 4 by 4 arrangement so that no row or column contains more than one cup or saucer of the same colour.

### Counting on Letters

The letters of the word ABACUS have been arranged in the shape of a triangle. How many different ways can you find to read the word ABACUS from this triangular pattern?

# Gridlock

##### Stage: 3 Short Challenge Level:
See all short problems arranged by curriculum topic in the short problems collection

If the square is completed with the letters A, B, C, D and E so that no row, column or either of the two main diagonals contains the same letter more than once, which letter should replace the asterisk?

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.