I try to do this like the title and also saying {_integer} parsed as an integer
Code:
set {_i} to random integer between 3 and 5
add {_i} parsed as an integer redstone ore to the player
#also I try this
set {_i} to random integer between 3 and 5
add {_i} parsed as an integer redstone ore to the player's inventory
#and like this too
set {_i} to random integer between 3 and 5
give {_i} parsed as an integer redstone ore to the player