Different Ways of Multiplying

Review

Memorizing Multiplication Tables for 1-digit multiplication plus 10s, 11s, 12s
Printable multiplication chart

Different Multiplication Techniques

Multiplication Techniques

• Standard
• Line Multiplication
• FOIL
• Approximate Values
• Area methods of multiplication

Why Learn Different Ways to Multiply?

Standard Multiplication

• Only one method to remember
• No decision to make on how to solve the problems
• Every arithmetic multiplication can be solved this way

Different Types of Multiplication

• One method might be faster or more accurate than the others
• Fun to chose which method works best
• Every arithmetic problem and algebra problems use these methods
• Sets the stage for understanding advanced math multiplication

FOIL

• Front, Outer, Inner, Last
• Remember Weird Al and Multiplication.
• 34 x 12
• = (30 + 4) x (10 + 2)
• Front:
• Outer:
• Inner:
• Last:
• Add together

Approximate Values

• A version of FOIL
• 34 is close to 35
• 12 is close to 10
• 34 x 12 = (35 -1) x (10 +2)
• Front:
• Outer:
• Inner:
• Last:
• Add:
• Good approximations

Multiplication Problems

Do these problems in at least two different ways.

Figure out which way works best

• 24 x 99 =
• 100 x 567 =
• 111 x 34 =
• 5 x 248 =