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There are 21 because 21/10 = 2.1
There are 21 tenths in 2.1.
21
21/100 ( Twentyone hundredths).
21.2857
2.1
21 to the nearest tenths is 21.0
21 tenths, i.e. 21/10 or 2.1 or 2 and 1/10
well 1 tenth is 3, so 3 tenths = 3x7 = 21