18.64 rounded to the nearest tenth is 18.6
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It is 8.0 : the trailing 0 is necessary to show that it has been rounded to the nearest tenths.
It is 8.70 - there is no work to show!
0.9%= 9/10 * 1%= 0.9 * 1%= 0.9%
It is 10.0, and the trailing 0 is required to show that the number is rounded to a tenth.
abc.def I use letters to show the meaning of placeholders in the Arabic decimal fraction system. "c" is the in units place. Five is just 5 on its own. "bc" is in the tens and the units places, 25 for example, twenty plus five. "abc" is in the hundreds place plus the tens place plus the units place. say 325. on the right hand side of the decimal place we start with ... "0.d" or the tenths position. so three tenths is 0.3 "0.de" would be a number of tenths plus a number of hundredths, say 0.38 JCF