What is 2 hundreds 5 ones 9 tens and 3 tenths?
To express the number "2 hundreds, 5 ones, 9 tens, and 3 tenths" in standard form, you would write it as 259.3. This is because the number 2 represents the hundreds place, the number 5 represents the ones place, the number 9 represents the tens place, and the number 3 represents the tenths place. Therefore, the number can be written as 259.3.