mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2021

15 December

The odd numbers are written in a pyramid.
What is the mean of the numbers in the 19th row?

Show answer

Tags: numbers

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2025

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022


List of all puzzles

Tags

triangle numbers sequences number logic square numbers factorials sport symmetry area triangles time albgebra geometric mean averages tiling addition remainders cube numbers fractions polynomials planes partitions speed geometry regular shapes lists median surds coins gerrymandering palindromes dates binary cubics digital products cryptic crossnumbers tournaments coordinates sets cards squares scales cryptic clues chess expansions quadrilaterals hexagons folding tube maps geometric means square roots neighbours rectangles products sums perfect numbers probability menace colouring floors consecutive numbers integration decahedra dominos spheres unit fractions volume clocks polygons quadratics axes star numbers calculus division grids christmas mean medians functions percentages prime factors integers means people maths elections combinatorics consecutive integers circles crossnumbers routes pascal's triangle balancing algebra ellipses graphs complex numbers ave chalkdust crossnumber tangents square grids chocolate shapes powers factors books multiples 2d shapes bases sum to infinity multiplaction squares angles numbers range trigonometry money matrices even numbers parabolas doubling shape determinants proportion games advent odd numbers 3d shapes pentagons prime numbers lines wordplay digits the only crossnumber dodecagons crosswords perimeter digital clocks taxicab geometry arrows dice differentiation indices multiplication rugby xor irreducible numbers probabilty

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2026