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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?

Advent Sudoku

Age 11 to 14
Challenge Level

Advent Sudoku

Like the conventional Sudoku, this Advent Calendar Sudoku consists of a grid of nine rows and nine columns subdivided into nine 3x3 subgrids.

However, rather than containing the numbers 1 to 9, this sudoku contains the nine different letters which are used in the words "Advent Calendar".

There are still two basic rules:
1. Each column, each row, and each box (3x3 subgrid) must have each of the nine letters (A, C, D, E, L, N, R, T, V).
2. No column, row or box can have two squares with the same letter.