Simple exercise of tenths...
Students understand that decimals are specific distances away from the nearest whole numbers and the halfway (mid point) between the two wholes.
These exercises help take the mystery out of decimals.
But, show the students that 2.8 and 2.80 are equivalent by using money.
8 dimes (0.8) are equal to 80 (0.80) pennies. Done...
decimals and money...easy for them to grasp.