0.12
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12 tenths as a decimal is 1.2
21 tenths, i.e. 21/10 or 2.1 or 2 and 1/10
12/10 as a decimal is 1.2
Oh, what a happy little question! To write twelve and seven tenths as a decimal, you simply place the whole number 12 before the decimal point and the tenths place 7 after the decimal point. So, twelve and seven tenths is written as 12.7. Just like that, you've created a beautiful decimal masterpiece!
It is 12 2/5.