How to Multiply - Howcast

# How to Multiply

The rules of multiplication extend beyond multiplying 2 whole numbers. Here are some of the others.

### Instructions

• Step 1: Multiply fractions Handle fractions by multiplying the numerators and denominators. Place the product of the numerators over that of the denominators and simplify.
• Step 2: Multiply polynomials Handle polynomials by multiplying each term in the 2nd polynomial by each term in the first one. Combine like terms.
• Step 3: Multiply signed numbers Multiply signed numbers the same way you multiply unsigned ones, but take into account the signs.
• TIP: If both numbers are negative or positive, the product is positive. If 1 number is positive and the other is negative, the product is negative.
• Step 4: Handle exponents Multiply 2 terms in the same variable by adding their exponents.
• Step 5: Multiply square roots Handle 2 terms involving the square roots of positive numbers by multiplying the 2 numbers under the square root sign. Multiplication is as simple as that unless, of course, you are like the snake who claimed he couldn't multiply because he was an adder.
• FACT: The concept of zero was in use in India five centuries before it made its way to Europe.

### You Will Need

• Fractions
• Polynomials
• Signed numbers
• Exponentials
• Square roots