Writing the number 5,608 in expanded form means we write out the number as a sum of whole thousands, whole hundreds, whole tens, and ones. You see all of it right from the number:

• It has 5 thousand = 5,000
• It has 6 hundred = 600
• It has 0 tens = 0
• It has 8 ones = 8

Now we write it as a sum: 5000 + 600 + 8