mscroggs.co.uk
mscroggs.co.uk

subscribe

Sunday Afternoon Maths III

 Posted on 2014-03-09 

Twenty

How many three digit integers are there for which the product of the digits is 20?

Show answer & extension

Tags: numbers

Colliding parallel people

If two people stand 1km apart and walk in the same direction, how far will the have to walk until they collide due to the curvature of the Earth? (diameter of Earth = 12,742km)

Show answer & extension

If you enjoyed these puzzles, check out Advent calendar 2024,
puzzles about taxicab geometry, or a random puzzle.

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025