List

Just Jottings (11-14)

Making a difference
problem
Favourite

Making a difference

Age
11 to 14
Challenge level
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How many different differences can you make?
Cryptarithms
problem
Favourite

Cryptarithms

Age
11 to 14
Challenge level
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Can you crack these cryptarithms?
Substitution Cipher
problem
Favourite

Substitution Cipher

Age
11 to 14
Challenge level
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Find the frequency distribution for ordinary English, and use it to help you crack the code.
Always a multiple?
problem
Favourite

Always a multiple?

Age
11 to 14
Challenge level
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Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...
Peaches today, Peaches tomorrow...
problem
Favourite

Peaches today, Peaches tomorrow...

Age
11 to 14
Challenge level
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A monkey with peaches, keeps a fraction of them each day, gives the rest away, and then eats one. How long can his peaches last?
Cuboids
problem
Favourite

Cuboids

Age
11 to 14
Challenge level
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Can you find a cuboid that has a surface area of exactly 100 square units. Is there more than one? Can you find them all?