On May 23-26, our 4th graders visited the Rahmi Koç Museum and attended the Colorful World of Mathematics workshop. They discovered the “touchable, lovable” side of mathematics by seeing that mathematics is not “incomprehensible, inaccessible” with interactive experiment sets. They had the opportunity to learn by thinking, playing and having fun with experiments such as puzzles, optical illusion, sound, probability, pattern, speed-movement in the workshop. In this workshop, they developed their mathematical thinking skills by enjoying the freedom to touch and experiment.