Multiplying with Zero
Area Model of Multiplication
http://www.youtube.com/watch?v=63DEGVLzS-I
2 Digit Times 2 Digit Multiplication
http://www.khanacademy.org/math/arithmetic/multiplication-division/multi_digit_multiplication/v/multiplication-5---2-digit-times-a-2-digit-number
Area Model of Multiplication
http://www.youtube.com/watch?v=63DEGVLzS-I
2 Digit Times 2 Digit Multiplication
http://www.khanacademy.org/math/arithmetic/multiplication-division/multi_digit_multiplication/v/multiplication-5---2-digit-times-a-2-digit-number