535.1 Rounding to the nearest tenth is the number after the decimal point. If it's followed by a number that is 5 or up you round up, such as this problem it's 535.057457 so it would become 535.1 but if it's 4 or lower then it stays the same. The numbers after the first two don't matter when rounding to the nearest tenth. Hope I helped you understand this a bit more.