mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2021

10 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. Today's number is the largest number you can make using the digits in the red boxes.
++= 20
+ + +
++= 10
+ + +
++= 15
=
7
=
23
=
15

Show answer

Tags: numbers, grids

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

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

Archive

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