Actually, there is an infinite number of decimals between 0 and 1.
1.5, 1.7
decimals from 7.0 to 8.4 with interval of .2 between each pair of decimals
.5+.5=1 .5*4=2 2+(.5)= 2.5
For the first part: 2.5 - 2.4 = 0.1 2-digit decimals have an interval of 0.01. 0.1 / 0.01 = 10. Since the endpoints are presumably not included ("between"), you have to count one less (10 - 1 = 9). (If you include both endpoints, you would actually have one more: 10 + 1 = 11.) The reasoning is similar for part 2 and 3.
Actually, there is an infinite number of decimals between 0 and 1.
There is an infinite number of numbers between 1 and 2.
1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9
1.5
There are an infinite amount of numbers between 1 and 2
1.5, 1.6
1.5, 1.7
decimals from 7.0 to 8.4 with interval of .2 between each pair of decimals
0.01 and 0.02
.5+.5=1 .5*4=2 2+(.5)= 2.5
There are infinitely many. -1.1, -1.01, -1.001, etc for example.
2.5