The number halfway between 7 and 31 is 19.
It is 16, the value halfway between the two middle numbers.
53 is halfway between 16 and 90.You calculate this as (16 + 90) / 2.
22 is halfway between 19 and 25 because 19+3=22, and 22+3=25.
19
It is 15
15
It is: 27
14.5
19
-14.5
26