# Puzzles

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#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

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sport rugby square roots time dodecagons prime numbers lines remainders coordinates pascal's triangle calculus perimeter rectangles probability doubling coins spheres logic probabilty arrows mean polygons dates angles multiples regular shapes fractions division 3d shapes balancing cube numbers surds means wordplay bases triangles sum to infinity 2d shapes clocks geometry games factorials number trigonometry speed complex numbers integers cryptic clues palindromes unit fractions symmetry star numbers floors squares partitions advent routes square numbers menace proportion grids planes hexagons christmas volume indices integration odd numbers algebra ave parabolas chalkdust crossnumber shapes averages crossnumbers money folding tube maps functions scales dice differentiation circles percentages perfect numbers digits ellipses sequences cryptic crossnumbers irreducible numbers colouring taxicab geometry cards numbers chess books shape people maths area quadratics factors addition graphs crosswords multiplication triangle numbers chocolate sums## Breaking Chocolate

You are given a bar of chocolate made up of 15 small blocks arranged in a 3×5 grid.

You want to snap the chocolate bar into 15 individual pieces. What is the fewest number of snaps that you need to break the bar? (One snap consists of picking up one piece of chocolate and snapping it into two pieces.)