Quote from Dr.Dan MATH STUFF “11 x 1 = 11, 11 x 2 is 22, 11 x 7 is 77 and so on...
- for double digit numbers, there is a shortcut to make it easy.
- the first number of the answer is the first digit of the number you are multiplying by
- the last number of the answer is the second digit of the number you are multiplying by
- the middle number is the sum of the numbers you are multiplying by
- makes sense? I think an example will be helpful...

• let's stay 11 x 14
• the middle number is (1 + 4) or 5
• the first number of the answer will be 1
• the last number of the answer will be 4

• so 11 x 14 = 154

• one more example: 11 x 42

• the middle number of the answer will be 6
• the first number of the answer will be 4
• the last number of the answer will be 2

• so 11 x 42 = 462

• it gets a little trickier when the the two numbers sum to be greater than 9, but it's just one additional step

• say 11 x 67
• 6 + 7 = 13, so the middle number will be 3 but you have to take the 1 and add it to the first number (this is like "carrying over" in normal additional)
• so the first number will be 6 + 1 = 7
• the last number will be 7
• so 11 x 67 = 737”