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Sunday Afternoon Maths LXVI
Cryptic crossnumber #2Sunday Afternoon Maths LXV
Cryptic crossnumber #1Breaking Chocolate
Square and cube endings
Sunday Afternoon Maths LXIV
Equal lengthsDigitless factor
Backwards fours
Sunday Afternoon Maths LXIII
Is it equilateral?Cube multiples
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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 LXVI,
puzzles about numbers, or a random puzzle.
puzzles about numbers, or a random puzzle.