You just look at each place value and add them together.
8 is in the thousands place, which is 8,000. 3 is in the hundred place, which gives you 300. The 7 is in the tens place, which gives you 70. The 4 is in the ones place, which gives you 4. Now, you need to combine them together.
8,000 + 300 + 70 + 4
8,374 or 8374
