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数学

位值计算器

Place Value Calculator

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Teaching place value: use physical manipulatives (base-10 blocks). One unit cube = 1, a rod of 10 = 10, a flat of 100 = 100, a large cube = 1,000. Seeing the physical size difference makes the concept concrete.

难度:中级

你知道吗?

Zero as a placeholder was independently invented by the Babylonians (~300 BCE), Mayans (~350 CE), and Indians (~500 CE). Without zero as a placeholder, you couldn't distinguish 52 from 502 from 5,002 — the number system wouldn't work.

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