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