Final answer:
The value is 0.9.
Step-by-step explanation:
To solve this problem, we need to find the value of each group of tenths. We are given that 2 groups of tenths equal 1.8. To find the value of one group, we divide 1.8 by 2:
1.8 ÷ 2 = 0.9
Therefore, each group of tenths is equal to 0.9.