Technique revision

Best technique to calculate 92²?

• Using (a+b) X (a-b)

• Using 2 digit multiplication

• Using (a+b)²

• Using (a-b)²

Best technique to calculate 99²?

• Using (a-b)²

• Using 2 digit multiplication

• Using (a+b)²

• Using (a+b)X(a-b)

Best technique to calculate 78X97?

• Using (a+b)X(a-b)

• Using (a+b)²

• 2 digit multiplication

• Using (a-b)²

Which of the techniques listed below will you use to calculate 17X25

• 2 digit multiplication

• (a+b)²

• (a+b)X(a-b)

• (a-b)²

Which technique will you use to calculate 54²?

• (a+b)X(a-b)

• (a-b)²

• 2 digit multiplication

• (a+b)²

(a+b)² = ?

• a²-b²+2XaXb

• a²+b²-2XaXb

• a²+b²+2XaXb

• a²-b²

(a-b)²

• a²+b²-2XaXb

• a²-b²-2XaXb

• a²-b²

• a-bXa-b

(a+b)X(a-b) = ?

• a² + b² - 2XaXb

• a² + b² + 2XaXb

• a² + b²

• a² - b²

89² = ?

• 90²+1²-2X90X1

• 90²+1²+2X90X1

• 90²-1²

• 90²+1²

53²

• 50²+3²

• 50²+3²-2X50X3

• 50²+3²+2X50X3

• 50²-3²