Chris Pine, Learn to Program Chapter 1 - Numbers

puts 1+2

# floats
puts 1.0 + 2.0
puts 2.0 * 3.0
puts 5.0 - 8.0
puts 9.0 / 2.0

# integers
puts 1+2
puts 2*3
puts 5-8
puts 9/2

# experiment with puts
puts 5 * (12-8) + -15
puts 98 + (59872 / (13*8)) * -52

# how many hours are in a year?
puts 24 * 365

# how many minutes are in a decade?
puts (60 * 24) * (365 * 10)

# how many seconds old are you?
puts (60 * 60) * 24 * (365 * 24)

# If I am 1031 million seconds old, how old am I?
puts 1031000000 / (60 * 60 * 24 * 365)