2.10 or 2.1
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Four tenths as a fraction: 4/10 ---> 2/5 Four tenths as a decimal: 0.4
To write one and five tenths as a number, you can simply add the whole number part (1) to the decimal part (0.5). This gives you 1.5. In decimal form, this represents one and five tenths.
Twenty-one tenths, which is 2 and one tenth or 2.1 in decimal.
2/10 and 7/10 as decimals are 0.2 and 0.7 respectively
2008 tenths is the same as 2008 / 10. Therefore, two thousand and eight tenths = 200.8