Fill in the appropriate value in the thousandths place for the decimal 2.568.
tens 
ones 

tenths 
hundredths 
thousandths 
 
2 
. 
5 
6 

2.568 = 2 ones 5 tenths 6 hundredths 8 thousandths = 2 ones + 5 tenths + 6 hundredths + 8 thousandths.
So the missing digit is 8.