Answer:
123.003
Explanation:
The thousanths place is the third decimal after the decimal point, as they go tenths, hundreths, thousandths. This number is a two. To round, we look at the number after it. If that number is 5 or greater, we round up. If that number is 0-4, we leave the previous number as is. In this case, the number is a 9, so we round up, giving us 123.003.