100 - one hundred (200 - two hundred; 300 - three hundred; ...) hundreds of books

1,000 one thousand (2,000 - two thousand; ...)
thousands of pupils

1.000.000 one million (2,000,000 - two million; ...)
millions of people

1,000,000,000 one billion (2,000,000,000 two billion; ...)
billions of stars​

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