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Upper KS2 Challenge

UKS2 Challenge

 

What is the number?

  • Its less than 100.
  • Its one more than a multiple of 3
  • Exactly one of its digits is prime
  • If you reverse its digits you get a prime
  • Its not a multiple of 5
  • Its not prime
  • It has exactly 4 factors
  • Its not square
  • The sum of its digits is prime
  • If you multiply it by 5 the answer is greater than 5
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