Make five numbers
Take ten cards numbered 0 to 9.
Each time use all ten cards.
Arrange the cards to make:
a. five numbers that are multiples of 3
b. five numbers that are multiples of 7
c. five prime numbers
Cycling Squares
In the circle of numbers below each adjoining pair adds to make a square number:
For example,
Can you make a similar - but larger - cycle of pairs that each add to make a square number, using all the numbers in the box below, once and once only?
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