Question

how would i round 2.179449472 to the nearest hundreth?

Answer 1

the "places" to the right of the decimal point are
tenths hundreths thousandths ten thousandths etc

in your case the 7 is in the hundreth's place

so your answer will be either 2.17 or 2.18
if the number to the right of the 7 is 4 or smaller, the answer is 2.17
if the number to the right of the 7 is 5 or more, the answer is 2.18