Math Shortcut #13 – Multiplying a Whole Number by 11

Step 1: Write the number.

Step 2: Write the same number directly below it, but move a step.

Step 3: Add.

Ex. 1:
64 X 11

Sol:
64  –> original
_64  –> written one step to the right (4 above is aligned with 6 below).  Then ADD.

704  –> Answer. 🙂

Ex. 2:
102 X 11

Sol:
102
_102
1122 –> Answer. 🙂

 

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