It is 2.90
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To round any number, look at the digit to the right of the place you are rounding to. If the digit is 5 or more, change the digit in the place you are rounding to to the next higher digit. If the digit to the right of the place you are rounding to is less than 5, leave the digit in the place you are rounding to as it is. Change all digits to the right of the place you rounded to to zeros. 4.175 rounded to the nearest hundredth is 4.18
Well, honey, you take a look at that number and see that the digit in the thousandths place is a 2, which means you don't need to round up. So, you keep the 3 before the decimal point, and then round the 2 up to a 3. Voila, you've got yourself 3.26 to the nearest hundredth.
Four point six (the two extra zeros are not neccessary).
2570.00
Six zeros: 127,000,000