Project Euler: Problem 10

Euler_10

def is_prime?(num)
  2.upto(num-1) { |i| return false if ((num % i) == 0) }
  true
end

def sum_primes(max)
  sum = 0
	2.upto(max-1) { |i| sum += i if is_prime?(i) }
	p sum
end