Three and ten tenths is equal to four. This is written as 4, and if accuracy to tenths is required, it is written as 4.0.
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To write nine tenths as a decimal, it looks like this: .9
0.3 = three tenths.
12.9 IS a decimal number. It is twelve and nine tenths.
To write "three hundred fifty-two and four-tenths" in standard form, you would combine the whole number and the decimal. The whole number "three hundred fifty-two" is written as 352, and the decimal "four-tenths" is written as 0.4. Therefore, when combined, "three hundred fifty-two and four-tenths" in standard form is written as 352.4.
Ten point three or ten and three tenths