What is 1 one 3 tenths in decimal form?

One and three tenths in decimal form is written as 1.3. This is because the whole number 1 represents one whole unit, and the decimal point separates the whole number from the tenths place value. The digit 3 in the tenths place indicates three tenths, which is equivalent to 0.3 in decimal form. Therefore, 1.3 represents one whole unit and three tenths combined.