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Unit 1, Book 1, Grade 4 Mathematics What are numbers, grades and counting units?
Number of digits: unit, ten, hundred, thousand, ten thousand, one hundred thousand. Hundreds of billions.

Several levels: individual level (one, ten, hundred, thousand), ten thousand level (ten thousand, one hundred thousand, one million, ten million), one billion (one billion, one billion, one hundred billion).

Counting unit: ten thousand \x09 thousand \x09 hundred \x09 ten \x09.