7.3. Since 3 is the tenth, you look at the number behind it (if there is no number behind it, it is already rounded). If that number is 5 or greater, increase the tenth value by one and replace everything after it with zero's (i.e. 6.89 rounded to tenth = 6.9(0)). If the number is 4 or lower (including 0), keep the tenth value the same, and turn everything after into zeroes (which is what we have here.
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Round 3.7416573 to the nearest tenth is 3.7
24.6 Round 24.583 to the nearest tenth? => 24.600
It is 54.0 and not 53.9 to the nearest tenth
It is 64.2 when rounded to the nearest tenth
It then is 1.5 when rounded to the nearest tenth