In this post i will show you how to multiply any two digit number with 11 verbally.
I am using term secondary number here for the number that we will multiply with 11
In 11*11 11 is secondary number
12*11 12 is secondary number
13 * 11 13 is secondary number
11*11 = 121
right most digit is the first number of the digit your multiplying here it is 1
middle digit is sum of of both number you are multiplying with 11 is 1+1 = 2
last digit is the one plus the carry if exist from second number on from middle digit here it is 1
11*13 = 143
right most digit is the first number of the secondary number 3
middle digit is sum of of both number you are multiplying with 11 is (1+3) 4
last digit is the one plus the carry on from middle digit here it is 1
11 * 14 = 154
right most digit is the first number secondary number here it is 4
middle digit is sum of of secondary number ( 4 + 1) = 5
last digit is the one plus the carry if exist from second number on from middle digit here it is 1
Lets try bigger number
11* 24
right most digit is the first number secondary number 4
middle digit is sum of secondary number ( 4 + 2) =6
last digit is the one plus the carry if exist from second number on from middle digit here it is 2
so the answer is 264
11 * 89
right most digit is the first number secondary number9
middle digit is sum of secondary number (8+9) = 17
ast digit is the one plus the carry if exist from second number on from middle digit here it is 8+1 = 9
answer is 979
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