When you look at the number 7,000 you obviously should see the number as 7/1000 --- 0/100 --- 0/10 --- 0/0 which is, of course, Seven-One Thousandths, Zero-One Hundredths, Zero-Tenths, Zero-Ones/Units. From there all you have to do is isolate which digits starting from the left, is in the tenths column and remove the digits past it which is in this case the units column.
answer: 700. 1/10 * 7000 = 700.