Research by the Gambling Commission indicates there could be a further 70,000 children aged 11 to 16 who are at risk of developing problems.
Matt Serlin, a Families Counsellor at Action on Addiction said gambling can be "traumatic" for families.
He said: "When a child has a problem with gambling it can be extremely frightening, confusing and traumatic for parents.
"It is important to remember that if a child gambles it does not automatically mean they are going to get addicted."
Unexplained absences from school or college
Sudden deterioration in grades or failure to complete assignments on time
Unaccountable explanation for new items of value in possession
Borrowing or stealing money
Selling personal belongings
Change or uncharacteristic shows of personality or behaviour
Unusual interest in newspapers, magazines, sports scores etc.
Withdrawing from family and friends
How can you combat gambling in your child?
Talk to your child about gambling
Show children that you are willing to talk to them openly
Give them the facts - ideally before they are exposed to the fantasy
Seek professional support if your child has a serious problem
Increased awareness and understanding
Offer a connection with people who've been through similar experiences
Where to seek help?