Around age 5, block play evolves from "building alone" to "collaborating with friends to create." Children are increasingly observed discussing how to proceed with their play, with comments such as, "How can we make it stronger?", "Let's build a city...

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"What shape does this block look like from the side?" "It looks like a different shape from above than it did before!" When playing with blocks, children sometimes notice that the shape changes depending on the viewing angle. In elementary...

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"The left and right sides are the same shape, aren't they?" "It's like looking in a mirror!" Have you ever made such a discovery? In elementary school, students learn about "line symmetry" and "point symmetry," but the foundational understanding for...

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Many people probably think of fractions as something you learn when you start elementary school. Indeed, in elementary school, children learn how to write and calculate fractions like "1/2," "1/3," and "3/4." But before that, what's important is "What is...

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