To find the number that is one-half of one-quarter of one-tenth of 800, you can calculate it step by step:
One-tenth of 800: (1/10) * 800 = 80
One-quarter of 80: (1/4) * 80 = 20
One-half of 20: (1/2) * 20 = 10
So, the number you're looking for is 10.
Hope this helps!