To multiply any two digit number by 11
- For this
example we will use 54.
- Separate the
two digits in you mind (5__4).
- Notice the
hole between them!
- Add the 5
and the 4 together (5+4=9)
- Put the
resulting 9 in the hole 594. That's it! 11 x 54=594
The only thing tricky to remember is that if the
result of the addition is greater than 9, you only put the "ones"
digit in the hole and carry the "tens" digit from the addition. For
example 11 x 57 ... 5__7 ... 5+7=12 ... put the 2 in the hole and add the 1
from the 12 to the 5 in to get 6 for a result of 627 ... 11 x 57 = 627
Practice it on paper first!
Practice it on paper first!
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