Shortcuts In Multiplication : Multiplying Two-digit Numbers By 11
SHORTCUTS IN MULTIPLICATION
Multiplication of Two-digit Numbers By 11
Case One : If the sum of the digits is less than ten
Example one : 34 * 11 = 374
The first digit of the product is also the first digit of the factor to be
Multiplied by 11.
The third digit of the product is the second digit of the factor to be
Multiplied by 11.
The middle digit of the product is the sum of the digits of the factor to
Be multiplied by 11.
Example two : 36 * 11 = 396
Example three : 42 * 11 = 462
Example four : 63 * 11 = 693
Example five : 45 * 11 = 495
Case Two : If the sum of the digits is greater than ten
Example One : 78 * 11 = 858
The first digit of the product is the first digit of the factor to be
Multiplied by 11 increased by one.
The third digit of the product is the second digit of the factor to be
Multiplied by 11.
The middle digit of the product is the second digit number of the sum
Of the digits of the factor to be multiplied by 11.
Example two : 39 * 11 = 429
Example three : 59 * 11 = 649
Example Four : 79 * 11 = 869
Example Five : 85 * 11 = 935
