To round the number to nearest tenth, you need to know whether the number next to 4 is greater than 5 or lesser than 5. If it is greater than 5, then, you will be adding + 1 to the tenths place. If it is the other way around, you will be leaving the number as it is, and just add zeros accordingly. The zeros after the decimal point don't really matter because they have no value, so if you don't add them, it would be totally fine.
It's 7.450 because if the tenths place is less that 5 than that's number stays the same and after that number is the 0s if it's greater than 5 than you just put the number up higher thanks how you round
