1,700,000
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17000000
35,000,017,003,000
Two of them are terminating decimals and recurring decimals
You need decimals when you measure and fractions. You need decimals, because to measure and fractions. Also, so whole numbers could exist if there are decimals. There will be no math if there's no decimals.
Some decimals are. Counting numbers are a proper subset of decimals.