Round 398.223 to the nearest ten

400

Step-by-step explanation:

Method for rounding:

Look at the number 1 place before the place you are rounding to.

If it is greater than 4: round up

otherwise: round down.

Ok,

here the number we're looking at is 8 cuz' 8 is in the ones place.

8 is bigger than 4 so we round up.

398.223 becomes 400

398.2

Step-by-step explanation:

Since there is one zero In 10 then you move the decimal place one to the right. However many zero's there are in a number your moving that many places to the right.