9 as a decimal can be written 9.0
3/10ths as a decimal can be written 0.3
17/100ths as a decimal can be writen 0.17
If you add 9.0 to 0.3 and then add 0.17 the result is 9.47
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17
The first place after the decimal point is the tenths place, the second is the hundredths place. The fractional part of 1.17 is 17/100, so to read the full number say (or write) "one and seventeen hundredths"
To write seventeen and seven hundredths in number form, you would write it as 17.07. In this decimal form, the digit 7 is in the hundredths place, indicating seven hundredths. The digit 0 after the decimal point is in the tenths place, indicating no tenths. The digit 7 before the decimal point is in the ones place, indicating seventeen ones.
17/100 = 0.17 as a decimal
Well, darling, 17 tenths as a decimal is simply 1.7. It's not rocket science, just move that decimal point one place to the left and voila! You've got your answer.