To express 9 ones and 3 tenths in decimal form, you would write it as 9.3. This is because each digit's place value increases by a factor of 10 as you move from right to left - the digit 3 is in the tenths place, so it represents 3 tenths. The digit 9 is in the ones place, so it represents 9 ones.
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9 ones 2 tenths 7 hundredths
.9
Three tenths and nine ones written as a decimal is 0.3 + 9 = 9.3
9/10 of 3 = 2.7
It is: 9/10 = 0.9