12 and eight tenths as a decimal is 12.8
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To write 12 tenths in decimal form, you divide the numerator (12) by the denominator (10). This division gives you 1.2, which is the decimal form of 12 tenths. In decimal form, each place value to the right of the decimal point represents a power of 10, with the first place being tenths.
12/10 = 1.2
12 and three tenths = 12 + 3/10 = 12 + (3 ÷ 10) = 12 + 0.3 = 12.3
1.212/10:= 12 ÷ 10= 1.2 in decimal
12.3