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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?

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Pair Sums

Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?

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Summing Consecutive Numbers

Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?

Advent Sudoku

Stage: 3 Challenge Level: Challenge Level:1


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.