### 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?

# Diagonal Product Sudoku

##### Stage: 3 and 4 Challenge Level:

Produced by Henry Kwok

#### The Basic Rules of Diagonal Product Sudoku

Like a conventional Sudoku, this Sudoku has two basic rules:
1. Each column, row and 3x3 subgrid must have the numbers 1 to 9.
2. No column, row or subgrid can have two cells with the same number.

The puzzle can be solved with the help of clue-numbers which are small numbers written next to the arrows on the intersections between cells.
Each clue-number is the product of the two digits in the two cells that are diagonally adjacent to each other. The position of each pair of diagonally adjacent squares is indicated by the arrows.

For example, 24 in the bottom left box means that the possible pairs of numbers for the cells indicated by the arrow are either 3 and 8, 8 and 3, 4 and 6, or 6 and 4.

Printable Diagonal Product Sudoku Worksheet