The small octopus tells fun math stories

The fun math stories for teaching the principles of addition and subtraction. Sailam the octopus has eight arms. Each time he uses them for counting. In this way, he was able to give the correct answer. And because he was always right, many animals asked for his help. But he gradually became very arrogant. One day, the crab asked him a question he couldn't answer. My dear children, can you help Sailam solve this problem? Sizes: 20×20