1. Add the ones digit of the first number to the first
2-digit number,

2. Put one zero to the result of #1,

3. Multiply the ones digit numbers,

4. Add the result of #3 to #2.

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Example: __

To multiply 17 and 12.

1. Add 7 to 12, we get 19

2. Put one zero to 19, we get 190,

3. Multiply the ones digit numbers, we have 7x2 = 14,

4. Add 14 to 190. The answer is 204.