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Sunday Afternoon Maths LXVII
Coloured weightsNot Roman numerals
Advent calendar 2018
Sunday Afternoon Maths LXVI
Cryptic crossnumber #2Sunday Afternoon Maths LXV
Cryptic crossnumber #1Breaking Chocolate
Square and cube endings
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rugby polygons cryptic crossnumbers proportion functions volume algebra dodecagons advent angles coins remainders clocks books indices number graphs spheres cryptic clues star numbers speed dice 2d shapes trigonometry hexagons rectangles complex numbers routes square roots calculus menace triangle numbers ellipses floors colouring cube numbers probability addition factors circles folding tube maps chalkdust crossnumber triangles cards ave sum to infinity differentiation quadratics scales square numbers means area perimeter wordplay shapes division partitions sequences sport multiplication integers crossnumbers people maths mean coordinates perfect numbers odd numbers geometry percentages grids planes shape palindromes sums prime numbers christmas 3d shapes digits squares lines integration factorials games averages chess bases numbers arrows doubling surds money probabilty pascal's triangle unit fractions multiples fractions symmetry logic balancing parabolas regular shapes dates time irreducible numbers taxicab geometry chocolate crosswordsSunday Afternoon Maths LXV
Posted on 20180513
Cryptic crossnumber #1
In this puzzle, the clues are written like clues from a cryptic crossword, but the answers are all numbers. You can download a printable pdf of this puzzle here.
1  2  
3  4  
5 
Across
 Down

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.)
Square and cube endings
Source: UKMT 2011 Senior Kangaroo
How many positive twodigit numbers are there whose square and cube both end in the same digit?
If you enjoyed these puzzles, check out Sunday Afternoon Maths LXVII,
puzzles about folding tube maps, or a random puzzle.
puzzles about folding tube maps, or a random puzzle.