The contest was held as part of World Maths Day and took place during Integrated Education Week.
Joseph received his award at a special assembly in his school, where principal, Ian Moore, praised his achievement.
Mr Moore said: "It is a great competition, a wonderful worldwide opportunity and I'm particularly pleased that Joseph accomplished so much. We are all very proud of him at Windmill Integrated Primary School and it was a great experience joining with others across the world in sharing a maths challenge."
More than 38,000 schools took part in the competition, representing 204 countries.
Denise Morgan, Northern Ireland Council for Integrated Education (NICIE) Development Officer, said:



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