Work out the number that is halfway between 27 times 38 and 33 times 38.show your working out aswell. would someone me and show me how to do it.

Find out the two numbers that you need to find the midway of. So it would be between 1026 and 1254. 
To find the number in between the two, add the two numbers and divide by 2. It's like finding the average
(1026+1254)/2
2280/2
1140
Hope this helps. 

She will need 5/8 bags for each square yard.