15/10ths is 1.5
7/100ths is .07
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15/10 + 7/100 = 1.57
15 tenths and 7 hundredths as a decimal is: 1.57
0.7
0.015. The first number after the decimal point is tenths, the second is hundredths, the third is thousandths.
To write 15 hundredths as a decimal, you would divide 15 by 100. This division would give you 0.15 as the decimal equivalent. In this case, the decimal point is placed two places to the left of the last digit to represent hundredths.