one tenth of 87 as a decimal number = 8.7
0.1 * 87 = 8.7
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A percent is that number over 100. Thus 87% can be rewritten as the fraction 87/100. If this is worked out as a division, it can be converted to the decimal 0.87.
0.875
87/100 as decimal is 0.87
87% = 0.87
87 tenths = 8.7