Well, honey, 7.8 rounded to the nearest tenth is 7.8. That's right, no change needed there. It's already sitting pretty as the closest tenths place value. So, no need to fuss over this one, just leave it be at 7.8.
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9.6
8.3
78% of 380 means (78/100) * 380 = 296.4 (exact)
It is then 56.5 when rounded to the nearest tenth
It is 0.8 when rounded to the nearest tenth