Let's say I counted: 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y A B C D E F G H I J K L M N O P Q R S T U V W X Y 10 11 12 13...

2*u=10, u0/3=a0, A/7=5

No need to "divide by 10", and we even have enough symbols already. All it would take is getting used to... just like what we did for years over and over in primary.

For "everyday human operations" you can just count: 0 5 a f k p u A F K P U 10... or 0 6 c i o u B H N T 10... or 0 a k u A K U 10... or 0 c o B N 10... or 0 f K 10... and so on. Notice how division by any multiple of 2, 3, 5, becomes much easier:

1/2=0.u, 1/3=0.f, 1/4=0.k, 1/5=0.c, 1/60=0.0a

Look at what happens with fractions:

2/3=0.K, 3/5=0.B, 5/12=0.p