7.9
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The tenth is the first digit after the decimal point, so use the second after the decimal point (the hundredth) to decided whether to round it up or down:
7.9372539 to the nearest tenth is 7.9 since 3 is less than 5.
It is 232.4 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
61.52 rounded to nearest tenth = 61.5
3934.9 is rounded to the nearest tenth.
1.4