Entry Nº 018Stage 2 · Grades 3–4数与代数
多位数的认识
万、亿……数位向左延伸，十进制走到多大都成立。
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Definition
个、十、百、千、万……每四个数位一级。不管数多大，相邻数位之间都是十倍关系——认识大数，只是把十进制的房子接着往左盖。
Where it comes from · where it goes
Prerequisites
What builds on it
(none yet)