The Pattern of Place Values There's no limit to how big or small a number you can write in expanded form. If you take it apart to its component place values, which is known as decomposing the number, you'll see that there is a 1 in the tens slot and a 1 in the ones slots.
Then you have seven hundredths and then you have four thousandths.
You can even write decimals in expanded form, as long as you understand how those place values work. This 5 is in the ones place.
The next slot to the right is the tens place, and there's a 9 in it. It's not adding any value to our expression or to our number. The next number is 12, which still has a 1 in the tens slot, but now there's a 2 in the ones slot.
You just have to know the value of each place or slot in the number. And we have four thousandths. And then finally, we go to the thousandths place. Notice that now the number in the tens slot has increased to 2, but the ones slot has reset to zero. That's just going to represent zero tens.
There are three pieces to this number:90 and 2. You're already familiar with the ones place, which remains on the far right of the number; in this case, you have two 1s.