And also ask him how much this would be. Many children are motivated by reward systems. Some parents put their kids on a point system. When they reach 100 points they may earn stickers, trading cards, even cash. Keep the progress record on a chart.
Some kids love physical activity.
Make songs about math facts. In the summertime, you can also organize a group of three or four children for a math lesson. Offer a reward, such as swimming, when the lesson ends successfully. It is important to stay patient with your child, accept the fact that some children take longer to learn new math concepts, and try to make it fun. Your child may surprise you by gaining new math facts and having fun along the way.