First name
Isobel
School
Norwich lower school
Country
Age
10
I thought of the square number 16. 16=4 x 4 so i took 1 away from 4 which gave me 3. Then i took 3 away from 16 which gave me 13.Then i added 13 and 3 together to make 16. This works because 3 and 13 are prime and 16 is square.