The number has a 4 in the hundreds place, which is written as
four hundred.

The number has a 1 in the tens place and a 9 in the ones place, which is written as nineteen.

The number written in words is four hundred nineteen.

First, identify which digit is in each place.

hundreds	9
tens	4
ones	6

Then, write the digits as a number.

First, use place value to find the value of each digit in the number.

The 8 in the hundreds place represents 8 hundreds.
So, the value of the 8 in the hundreds place is 800.

The 7 in the tens place represents 7 tens.
So, the value of the 7 in the tens place is 70.

The 4 in the ones place represents 4 ones.
So, the value of the 4 in the ones place is 4.

Then, write the values as a sum to write the number in expanded form.

In expanded form, the number is separated into a sum of the values of each digit.

The 900 means the number has a 9 in the hundreds place.
The 70 means the number has a 7 in the tens place.
The 2 means the number has a 2 in the ones place.

So, 900 + 70 + 2 written as a number is 972.