In Ruby you can perform all standard math operations on numbers, including: addition +, subtraction -, multiplication *, division /, find remainders %, and work with exponents **.

• Numbers can be added together using the + operator.

15 + 25
# returns:
40

• Numbers can be subtracted from one another using the - operator.

25 - 15
# returns:
10

• Numbers can be multiplied together using the * operator.

10 * 5
# returns:
50

• Numbers can be divided by one another using the / operator.

10 / 5
# returns:
2

• Remainders can be found using the modulus % operator.

10 % 3
# returns:
1 # because the remainder of 10/3 is 1

• Exponents can be calculated using the ** operator.

2 ** 3
# returns:
8 # because 2 to the third power, or 2 * 2 * 2 = 8