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2.9. There are, of course, ten tenths in the value of 1. So 9 tenths is 9 out of that 10 which is 9/10 or 0.9 - just 0.1 less than 1.

Add the 2 in front and you have 2.9.

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9y ago
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Q: How do you write 2 and nine tenths as a decimal?
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