Temp Multiplication Review

Different Ways of Multiplying

Review

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

Different Multiplication Techniques

Multiplication Techniques

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 =