mscroggs.co.uk
mscroggs.co.uk

subscribe

Sunday Afternoon Maths XL

 Posted on 2015-03-08 

The sixth cent

You toss 6 fair coins, and I toss 5 fair coins. What is the probability that you get more heads than I do?

Show answer & extension

One hundred factorial

How many zeros does \(100!\) end with?

Show answer & extension

Two triangles

Source: Maths Jam
The three sides of this triangle have been split into three equal parts and three lines have been added.
What is the area of the smaller blue triangle as a fraction of the area of the original large triangle?

Show answer & extension

If you enjoyed these puzzles, check out Advent calendar 2024,
puzzles about coins, 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

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

Archive

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