Answer is :

7 addition signs could be used,

9+8+7+65+4+3+2+1 = 99

A drove of sheep and chickens have a total of 99 heads and feet. There are twice as many chickens as sheep. How many of each are there?

Map of our town is represented in the map below:

If home is represented by the blue house and the store is represented by a red store, how many possible routes can we take to get from our house to the store?