We shall be using Replt as our play ground environment for ruby.

Numbers in ruby can be integer or float depending on how it was specified

puts "Enter first number" var1.to_i = get.chomps  puts "Enter second number" var2.to_i = get.chomps  puts "your result is #{var1.to_i + var2.to_i}"  

to_i:convert to string
to_f:convert to float
rand:generate random value
.time:repeat a variable by x times

20.times {rand(100)}   

You can guess the answer i owe you a bottle of beer.You can experiment with more arithmetic operators like + ,/,-,%