Answer:

1. The decimal numbers that lies between 1.5 and 1.7 is 1.6.
2. The decimal numbers that lies between 10.0 and 10.2 is 10.1.
3. The decimal numbers that lies between 5.1 and 5.5 are 5.2, 5.3, and 5.4.
4. The decimal numbers that lies between 2.2 and 3.4 are 2.3,2.4,2.5,2.6,2.7,2.8,2.9,3.0,3.1,3.2,and 3.3.
5. The decimal numbers that lies between 1.1 and 2.3 are 1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.1, and 2.2.