mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2021

18 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the product of the numbers in the red boxes.
++= 11
+ × ×
++= 17
× - +
++= 17
=
11
=
17
=
17

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

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

Archive

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