Ingenious
Wanted the edge of a centre of two objects, 7.5" and 28.25". Divide both by two, tap on the answer of line 2 minus line 1, tap and hold the new answer of 10.375 and select format > display type fraction: 10 3/8". Took me 15 seconds and a co-worker 5 minutes. He didnt believe I got the answer so quick so he did it later himself, taking 20 times as long. Buy this.
SpecialKen about
Soulver, v2.5.4